How do I beat the Psychic Gym in Sapphire with this team?

I am trying to beat the Psychic gym, but I keep losing. I can never win.

TEAM:Sableye lvl. 22Moves:AstonishScratchForsightNight Shade

Aron lvl. 11Moves:TackleCutMud-SlapHeadbutt

Shuppet lvl. 26Moves:ScreechNight ShadeCurseSpite

Graveller lvl. 35Moves:MagnitudeRock TombSelfDestructStrength

Manectric lvl. 32Moves:RoarQuick AttackSparkOdor Sleuth

Swellow lvl. 45Moves:PeckAerial AceWing AttackFly

What is the best strategy in fighting this gym and training up my Pokemon and the moves that I need.

Pleaselog inorregisterto add a comment.

First thing first, you need to severely level up your entire team except for Swellow. Now, Tate and Liza both have a level 42 Lunatone and Solrock. Now, onto your team. Movesets need some serious improvements, but I would focus on Sableye. With Sableye being a Dark Type, it is Immune to Lunatone’s only attacking move being Psychic. However, you do have to worry about Hypnosis, but not too much. With this being said, we just have to focus on Solrock. With this team, I would just Level Up Shuppet to survive and use Night Shade on Solrock to wear it down and KOwith help from your team. Also, teach Sableye Shadow Ball. It’s better than Astonish. There are many more improvements I can make, but if you want them, let me know. Alternatively, you can teach Swellow Steel Wing to cover Solrock. Hope this helps!