Ok, so I've been trying to build a team that's strong in Sp. Attack. The "staple" I guess you'd call it, are psychic pokemon or pokemon who can use psychic moves. So one of the pokemon I've been trying to get is a meditite with a nature that improves the sp. atk stat, but doesn't decrease the atk stat (not modest).

I've caught about 10 different meditites, and the best I've found was a docile meditite... Is there a reason I can't find a good meditite, or am i just being a bit impatient?

NOTE: I have never caught pokemon based on natures before... Ive only used what i caught first, and i would sometimes get lucky.