Gardevoir. It has very high special attack.
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-Azumarill -Magnetric -Breelom -(A flying pokemon) -(a normal, fighter or psychic)
You can buy it at the game corner.
Meditite is in Ruby, Sapphire, and Emerald. It’s Psychic/Fighting and evolves into Medicham starting at level 37.
Here is a list of all pokemon that can learn Psychic: http://www.serebii.net/attackdex/psychic.shtml
Drowzee and Hypno are top choices. but most psychic Pokemon know/can learn Hypnosis.