It's an old Showderp set.
Sigilyph
Magic Guard
@Flame Orb
-Roost
-Cosmic Power
-Stored Power
-Psycho Shift
Magic guard makes it to where it can only take damage from direct attacks. no status, no weather, no partial trapping, anything
with cosmic power, it boosts def and sp. def to become unkillable and increase stored power's strength
roost is recovery and psycho shift helps it fuck over offensive enemies by transferring a burn
