So I beat the game with Pikachu, Venusaur, Blastiose, Charizard, Machamp and Dugtrio. And I feel it could be stronger without Mewtwo and I killed Moltres and Zapdos. I was thing Starmie for Blast and Eggy for Venusaur. Good idea or bad? And other replacements?

Well I would recommend Mew (he has extremely well-balanced stats) but since you already beat it, that glitch is impossible now unless you start over. Also I like Golduck more than Blastoise because of Golduck's Speed and psychic type. Alakazam would definitely be one to consider because he has one of the highest Special capabilities in the game. Furthermore, I'm not sure what you're talking about by "Eggy"...Are you referring to and Execute/Executor(sp?)?

i always use crazy combos you'd never expect. like a pikachu starmie rhydon tangela/syther magmar and electabuzz. rarer cool types you know.