any fighting type move like aura spere, focust blast, or brick break if anyone wants my shiny arceus just trade me whatever i hate pokemon
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Psychic, Ghost and Dark type Pokémon. Gastly is also strong against itself, if you teach it a move like Shadow Ball. Otherwise get Mewtwo or Alakazam to use their powerful Psychic attack.
Regigigas is a Sinnoh pokemon. Not a Hoenn.
Unfortunately, fighting Pokemon are not super-effective against dragon-type Pokemon. However, if the fighting-type (move or Pokemon) is strong enough, it can still do substantial damage against a dragon-type Pokemon.
Regigigas is a pure Normal-type Pokemon.
The pokemon that are strong against psychic are bug, dark, and ghost.