I recently replaced the batteries in my Gen 1, 2 and 3 carts and did myself a marathon. Here are my teams in Gens 1 and 2:
Red:
- Charizard lv47
- Butterfree lv46 (people say it's useless... IDK, I used it to finish off Blue's Blastoise
)
- Gyarados lv47
- Raichu lv48
- Dugtrio lv46
- Mew lv45 (got it with the glitch; used it mostly as half HM slave, half last resort; never used in in fights with the Elite 4)
Blue. I went old-school with this playthrough, used only my starter and another Pokémon as a backup:
- Blastoise lv63
- Mew lv56
Yellow:
- Pikachu lv47
- Charizard lv47
- Hypno lv45
- Nidoking lv46
- Venusaur lv45
- Blastoise lv47
Gold:
- Feraligatr lv66
- Ampharos lv63
- Golem lv63
- Alakazam lv63
- Togetic lv61
- Dragonite lv60
Silver. Another old-school playthrough. I didn't even attempt to battle Red in this playthrough (which is kinda obvious
):
- Typhlosion lv67
- Ledian lv40
- Togetic lv 42
Crystal:
- Meganium lv60
- Sneasel lv63
- Crobat lv61
- Heracross lv60
- Lanturn lv60
- Arcanine lv60