Dualoud

Hi, I'm quite new to pvp in pokemon so sorry if my question looks dumb but i wonder how important are IV's when i see prices of pokemons vary from one to double for an increase of 4-5 points in IV's ? I mean does it really matter on a scale of 300 stat points ? I mean most of the time, the pokemon with the highest base speed will be the fastest so 25 speed or 31 speed, does it really makes à difference or is it just about over-optimization ? For example, is a 27 SPD/27 SPA Greninja good enough ? Oh and btw side question, i read somewhere (can't find it back tho) that dugtrio and and blaziken are banned. Is it the case for ranked only or casual PvP too ? Thx :)

How much for greninja ?

Hi, i'm new to the game and i wanted to know smth : Once i get the 4th badge in kanto, can i only buy pokemons from Kanto or pokemons from Johto, etc ? And Can i use them in Kanto ? Or do i have to clear the other areas first ? Thx ;)