3rd Gen Worth having pokémon in backhand?

[Crashking]

Yeah, I'm thinking if it's worth training pokémon and store them, and then take them out when needed, or if it's better to have a whole party that you constantly train and never do anything with it. Like now I plan having:
Charizard
Blastoise
Venusaur
Alakazam
Zapdos (Pikachu/Raichu)
Butterfree/other bug pokémon

Exchanging with other pokémon, like:
Moltres
Can't remember name on last legendary
Pidgeot
Raticate
Primeape
*goes on*

Or should I just train the party I find out that fits best as high as possible?

 

[J3]

It really depends on you but my opinion is this.I would rather have 6 pokemon at Lv 100 then ten at Lv 50.also look at your team's weakness and strenghts make sure what one lacks in the other pick up in.