How many megachips are there because if there are 81 I'm missing mistmanv4..

There are 82 or 86 mega chips.

Ok there's 85 and they re hard to get. Ill list them all and tell you how to get them so you know what ones youre missing. But most of them you can get from the bug frag trader in secret 3.

M001: Muramasa
-- Does damage equal to the amount of HP you've lost
-- Found from the NumberMan Trader, code 50098263

M002: HeroSwrd (180)
-- Attacks three squares ahead of you
-- NumberMan Trader, code 03284579

M003: ZeusHamr
-- Hits everybody for 250 damage (including you)
-- Trade GrabBack K in Hades Isle lava room

M004: StandOut (220)
-- Sends fire in a straight line to the nearest hole
-- Need to be Heat style
-- Higsby's regular stock

M005: Salamndr (300)
-- Sends fire in a straight line to the nearest hole
-- Need to be Heat style
-- NumberMan Trader, code 65497812

M006: WatrLine (180)
-- Brings water out of all holes in a straight line
-- Need to be Aqua style
-- Higsby's regular stock

M007: Fountain (240)
-- Brings water out of all holes in a straight line
-- Need to be Aqua style
-- NumberMan Trader, code 88543997

M008: Ligtning (160)
-- Hits area one square around field object
-- Need to be Elec style
-- Higsby's regular stock

M009: Bolt (210)
-- Hits area one square around field object
-- Need to be Elec style
-- NumberMan Trader, code 54390805

M010: GaiaSwrd (100)
-- Takes the attack power of the chip after it and adds it
to it's own
-- Need to be Wood style
-- Higsby's regular stock

M011: GaiaBlad (100)
-- Takes the attack power of the chip after it and adds it
to it's own
-- Need to be Wood style
-- NumberMan Trader, code 33157825

M012: Meteors (40)
-- Rains 30 meteors on the enemy area
-- Secret 2 merchant

M013: Guardian
-- If damaged, will do 200 electric damage to the damager
-- Found behind a curtain behind DrillMan's cube in Undernet 7

M014: Anubis
-- An Anubis statue will drop and slowly poison the enemy
-- Bought from the Undernet 2 BugFrag merchant

M015: GodStone (150)
-- Summons GodStone from a broken panel to drop rocks on the enemy
-- Beach Square merchant

M016: OldWood (100)
-- Summons OldWood from a broken panel to skewer the enemy (Wood)
-- Grass panels power up attack
-- Higsby's regular stock

M017: Jealousy (100)
-- Deals more damage the more chips the enemy has selected
-- PMD, DNN Editing Room Console

M018: Poltrgst
-- Launches all field objects at enemy for 150 dmg/hit
-- Ghost Navi behind Tree of Life after beating Alpha

M019: LifeAura
-- Prevents any attacks of less than 200 damage
-- Found from the Scutz family in Secret 3

M020: FullCust
-- Fills your Custom meter
-- UnderSquare merchant

M021: Atk+30
-- Adds 30 to the attack power of the chip before it
-- Merchant in Secret 2

M022: Navi+40
-- Adds 40 to the attack power of the Navi chip before it
-- Reward from Quiz King on top of Hades Isle

M023: Roll (20)
-- Attacks the enemy and heals you
-- Mayl, FlashMan scenario

M024: Rollv2 (30)
-- Attacks the enemy and heals you
-- Mayl, BubbleMan scenario

M025: Rollv3 (40)
-- Attacks the enemy and heals you
-- Mayl, Alpha scenario

M026: GutsMan (50)
-- Smashes the enemy's panels and sends out three shockwaves
-- Dex, FlashMan scenario

M027: GutsManv2 (70)
-- Smashes the enemy's panels and sends out three shockwaves
-- Dex, BeastMan scenario

M028: GutsManv3 (90)
-- Smashes the enemy's panels and sends out three shockwaves
-- Dex, Alpha scenario

M029: GutsManv4 (100)
-- Smashes the enemy's panels and sends out three shockwaves
-- Dex, Alpha scenario

M030: ProtoMan (160)
-- Slashes all the enemies
-- Chaud, Secret Area scenario

M031: ProtoManv2 (180)
-- Slashes all the enemies
-- Chaud, Secret Area scenario after defeating DarkMan

M032: ProtoManv3 (200)
-- Slashes all the enemies
-- Chaud, Secret Area scenario after defeating YamatoMan (JapanMan)

M033: ProtoManv4 (220)
-- Slashes all the enemies
-- Chaud, Secret Area scenario after defeating YamatoMan (JapanMan)

M034: FlashMan (50)
-- Shocks and paralyzes the enemies (Elec)
-- ACDC 3, at a dead end near the Square entrance

M035: FlashManv2 (70)
-- Shocks and paralyzes the enemies (Elec)
-- ACDC 2, random encounter

M036: FlashManv3 (90)
-- Shocks and paralyzes the enemies (Elec)
-- ACDC 2, random encounter

M037: FlashManv4 (120)
-- Shocks and paralyzes the enemies (Elec)
-- ACDC 2, random encounter

M038: BeastMan (40)
-- Performs Primal Rage on enemy three panels in front of you
-- SciLab 1, in a dead end near the lower entrance to SciLab 2

M039: BeastManv2 (50)
-- Performs Primal Rage on enemy three panels in front of you
-- Lan's doghouse, random encounter (SneakRun MUST BE ON!)

M040: BeastManv3 (60)
-- Performs Primal Rage on enemy three panels in front of you
-- Lan's doghouse, random encounter (SneakRun MUST BE ON!)

M041: BeastManv4 (70)
-- Performs Primal Rage on enemy three panels in front of you
-- Lan's doghouse, random encounter (SneakRun MUST BE ON!)

M042: BubbleMan (20)
-- Shoots spears across your row (Aqua)
-- Yoka 1

M043: BubbleManv2 (20)
-- Shoots spears across your row (Aqua)
-- Beach 1 (Must have less than 25% HP)

M044: BubbleManv3 (20)
-- Shoots spears across your row (Aqua)
-- Beach 1 (Must have less than 25% HP)

M045: BubbleManv4 (20)
-- Shoots spears across your row (Aqua)
-- Beach 1 (Must have less than 25% HP)

M046: DesertMan (120)
-- Launches sand hands at the enemy
-- Beach 1

M047: DesertManv2 (140)
-- Launches sand hands at the enemy
-- Yoka Inn TV, random encounter

M048: DesertManv3 (160)
-- Launches sand hands at the enemy
-- Yoka Inn TV, random encounter

M049: DesertManv4 (180)
-- Launches sand hands at the enemy
-- Yoka Inn TV, random encounter

M050: PlantMan (20)
-- Vines ensnare enemies and deal damage (Wood)
-- Undernet4, dead end on the red level

M051: PlantManv2 (30)
-- Vines ensnare enemies and deal damage (Wood)
-- Hosp Comp 3, random encounter

M052: PlantManv3 (40)
-- Vines ensnare enemies and deal damage (Wood)
-- Hosp Comp 3, random encounter

M053: PlantManv4 (50)
-- Vines ensnare enemies and deal damage (Wood)
-- Hosp Comp 3, random encounter

M054: FlamMan (120)
-- Flames burn the enemies (Fire)
-- Control the flames with the D-Pad!
-- Undernet5, dead end near the UnderSquare portal

M055: FlamManv2 (150)
-- Flames burn the enemies (Fire)
-- Control the flames with the D-Pad!
-- Yoka 2, random encounter (use OilBody for ease)

M056: FlamManv3 (180)
-- Flames burn the enemies (Fire)
-- Control the flames with the D-Pad!
-- Yoka 2, random encounter (use OilBody for ease)

M057: FlamManv4 (210)
-- Flames burn the enemies (Fire)
-- Control the flames with the D-Pad!
-- Yoka 2, random encounter (use OilBody for ease)

M058: DrillMan (70)
-- Three drills pop out of the ground, then three rocks fall
-- Undernet6

M059: DrillManv2 (90)
-- Three drills pop out of the ground, then three rocks fall
-- Hades Isle, random encounter

M060: DrillManv3 (110)
-- Three drills pop out of the ground, then three rocks fall
-- Hades Isle, random encounter

M061: DrillManv4 (130)
-- Three drills pop out of the ground, then three rocks fall
-- Hades Isle, random encounter

M062: MetalMan (100)
-- Smash a square with a crushing fist
-- Control MetalMan by holding A and the D-Pad!
-- Tamako, BeastMan scenario

M063: MetalManv2 (130)
-- Smash a square with a crushing fist
-- Control MetalMan by holding A and the D-Pad!
-- Tamako, DesertMan scenario

M064: MetalManv3 (160)
-- Smash a square with a crushing fist
-- Control MetalMan by holding A and the D-Pad!
-- Tamako, DrillMan scenario

M065: MetalManv4 (190)
-- Smash a square with a crushing fist
-- Control MetalMan by holding A and the D-Pad!
-- Tamako, DrillMan scenario

M066: KingMan (140)
-- Land three squares ahead and send shockwaves in a +
-- Does not damage if it lands on an enemy or broken panel
-- Tora, DesertMan scenario

M067: KingManv2 (170)
-- Land three squares ahead and send shockwaves in a +
-- Does not damage if it lands on an enemy or broken panel
-- Tora, PlantMan scenario

M068: KingManv3 (200)
-- Land three squares ahead and send shockwaves in a +
-- Does not damage if it lands on an enemy or broken panel
-- Tora, Alpha scenario

M069: KingManv4 (240)
-- Land three squares ahead and send shockwaves in a +
-- Does not damage if it lands on an enemy or broken panel
-- Tora, Alpha scenario

M070: MistMan (90)
-- Mist surrounds the enemies and MistMan punches them
-- DNN Battle Console, DrillMan scenario

M071: MistManv2 (110)
-- Mist surrounds the enemies and MistMan punches them
-- DNN Battle Console, Alpha scenario

M072: MistManv3 (130)
-- Mist surrounds the enemies and MistMan punches them
-- DNN Battle Console, Secret Area scenario

M073: MistManv4 (150)
-- Mist surrounds the enemies and MistMan punches them
-- DNN Battle Console, Secret Area scenario

M074: BowlMan (100)
-- Pins appear and get bowled into the enemy
-- Trade with Blue

M075: BowlManv2 (120)
-- Pins appear and get bowled into the enemy
-- Trade with Blue

M076: BowlManv3 (140)
-- Pins appear and get bowled into the enemy
-- Trade with Blue

M077: BowlManv4 (160)
-- Pins appear and get bowled into the enemy
-- Trade with Blue

M078: DarkMan (30)
-- DarkMan opens up caves in the enemy area which send out bats
-- Opens up a Hole!
-- Secret 1, where you found Geddon3

M079: DarkManv2 (30)
-- DarkMan opens up caves in the enemy area which send out bats
-- Opens up a Hole!
-- Undernet6, random encounter (NaviCust MUST be bugged!)

M080: DarkManv3 (30)
-- DarkMan opens up caves in the enemy area which send out bats
-- Opens up a Hole!
-- Undernet6, random encounter (NaviCust MUST be bugged!)

M081: DarkManv4 (30)
-- DarkMan opens up caves in the enemy area which send out bats
-- Opens up a Hole!
-- Undernet6, random encounter (NaviCust MUST be bugged!)

M082: YamatoMan (40)
-- Rapid spear attacks, then a sharp jab
-- Secret 2

M083: YamatoManv2 (45)
-- Rapid spear attacks, then a sharp jab
-- Samurai armor in Yoka Inn, random encounter

M084: YamatoManv3 (50)
-- Rapid spear attacks, then a sharp jab
-- Samurai armor in Yoka Inn, random encounter

M085: YamatoManv4 (55)
-- Rapid spear attacks, then a sharp jab
-- Samurai armor in Yoka Inn, random encounter

Phew! Done. To get Team Style or also called Brother Style you have to constantly use Navi Chips. Hope it helps.