Hi there! I need to collect all the 200 standard chips. I have 190 and..

Super Vulcan V - Prize for beating the fifth virus battler
Neo Variable N - Sky Area 1 Bug Frag Shop
Now in order to get the Justice One J Chip you need to trade chips in this order if you want them to appear.
(1)Girl in 1-2 Class
Give - Energy Bomb K - Get - Double Shoot C
(2)Boy in Seaside Town Aquarium
Give - Double Shoot C - Get - High Boomerang V
(3)Pink Navi is Seaside Town Watertank
Give - High Boomerang V - Get - Steal Revenge I
(4)Woman in the main room of Sky Town
Give - Steal Revenge I _ Get - Big Bomb O
(5)Blue Navi in ACDC HP
Give - Big Bomb O _ Get - Justice One J
And it work's i've tried it myself
Mine S - Sky Area 1 Bug Frag Shop
GrabRvng Q - Sky Area 1 BF Shop
Sanctuary Z - Undernet Zero Net Merchant for 15200Z
Full Custom * - Sky Chip Trader
BugFix P - Oxygen Tank Comp - PMD
But I don't know which chip you mean by "MegaBeam"

By MegaBeam, I believe you mean MagCoil. You find it randomly in Green mystery data in the ACDC area.