Does anyone have tips for wish cave, or any other dungeons that start you..

You should NOT use any Pokemon you listed above. You should use (in priority) Alakazam (High Defense, Teleport to escape from foe), Mew (floating, fast level up), Charizard (Heat Wave). Or you can use any grass starter for their fast level up stat.
Purity Forest: On the first few floors level up your Pokemon, make sure you have enough food supply or else. You should know how to run on later floors, think of the fastest way to escape, and mind your step. Remember to get one of these IF you have a chance: Pass Scarf (help you out a lot in dealing with the enemy), Warp Scarf (base on your luck, use this to warp to another place on the floor), Detect Band (raise Evasion, you less likely to take hit), Tight Belt (on the first few floor, if you see one, grab it, you may want to get one on the later floors but it has no use there), Mobile Scarf (walk through wall, dangerous if you don't have a sufficient food supply), Stun/Sleep/Allure/Blinker/Hunger/Totter Seed (slow down foe a bit, but only get a total of 4 maximum), Quick Seed/Orb (speed you up, 2 of them max), Warp Seed (use to escape instantly, 3 max), Decoy/Invisify/Mobile/Petrify/Slumber/Totter/Slow/Warp Orb (used to deal with monster house), Shocker Orb (prevent the Pokemon from attacking you in a few turn), Itemizer Orb (eliminate the enemy and have an item). Leave 4 slots for food.

If you have action replay use it to get all the items then take out a lot of joy seeds and one room orbs also use the more belly and max/infenint belly cheat and bring some moves with you just in case you lose some when your level 1 I reccomend the ones your Pokemon knows right now

The key is amount of HP. Try bringing a strong legendary like Rayquaza who will have a lot of health even at lv 1, then bring two others that are strong and will have moderately high HP (one of them has to know surf, of course, to get to the dungeon).