Welcome to PokéCommunity! Register now and join one of the best fan communities on the 'net to talk Pokémon and more! We are not affiliated with The Pokémon Company or Nintendo.
if you said for me, i'll choose type advantage if the battling Pokémons have the same level.
but actually, they both do hand in hand, just as what Champloo said.
Of the two, type variantion causes a greater power dissonance in one side's favour, as 150vs50; statistic variation is more akin to being 150v100 with no advantage taken of weaknesses. Types are also much easier to exploit.
Well. n00bs like to go with stats [that's why they have 999 stat GS/AR codes].
However, most people know to combine them.
A team with 6 different-typed Pokémon with terrible stats is worth less than a team with 4 different-typed Pokémon with EV Training.
It's that simple.
You can't choose one.
I don't really get EVs I just try to have as much type advantage as possible. I know a bit about how to use a Pokémon's highest base stats but I prefer type advantage as I'm an all power attack trainer with the ocassional stat. move thrown in :P