Since bug is basically the first thing you can usually catch, do you remember what was the first one you got? I owned blue, so I'm pretty sure Caterpie was the first! I should check my old cartridge...
pinsir on my firered my 6 pokemon in my pokedex (yes i had been using charzard and nidorino)
Wurmple. D/P ftw.
Wurmple FTW. My dustox was a beast
Uhmmmmmm that was a lonngg time ago XD But I think..... it might have been ladyba. lol
Depends on what you mean with caught xP
If registered overall then Caterpie in Link/Trozei :3
If not then Kricketot in Diamond :O
Although I did catch a Heracross in Silver it wasn't technically my game :/