And quickly became worthless because Blastoise could end up with DEF outa this world and Charizard's attack, s.attack was off the charts and had moderate DEF. Char could also learn fly which was more useful in endgame than solar beam because almost everything killed Venusaur too fast.
My endgame squad was
Zapdos (loaded with speed and attack. Drill Peck was almost always a one shot and first move)
Vileplume (everything Venusaur could do but faster and with more S.Attack)
Mewtwo
Charizard
Gyrados
Dragonite
Man, nikkas got ate ALIVE back in 5th grade