pschysic is good against pschyic

no water are good for it like swampert and use dive,waterfall,surf or MUDDY WATER for the most effective thing!!

and dark. i used my mighteyana to defeat tate and liza's xatu but xatu was stronger and it failed....use bite ok? and also leaf! use razor leaf!! yeah its effective even if its weakness is psyshic type.

this is just our lil secret ok? my classmate, giolo(pronounce as jolo), crushes on tate!!! ewww..

types of moves that are super-effective against psycic pokemon are Dark, Ghost and Bug. If your fighting the leaders Tate & Liza you should have some pokemon that know water moves. water moves are super effective to Solrock, Lunatone and Claydol and electric moves are super effective to their Xatu. But all four of their pokemon have weakness to Dark, Ghost and Bug types.

dark type

Dark, Ghost, and Bug are good against Psychic types. As Salamence120 said, Muddy Water is an excellent move to use against Lunatone and Solrock. For Xatu, if you don't want an Electric type, try going for Dark. Maybe Mightyena? And that's just wrong, nothing is good about Tate.... Blech.

fire is also very effective. Although the fire pokemon is pretty weak against psichich attacks

ghost type like shadow ball