The best moveset for Gardevoir in Pokemon Ruby, Sapphire, and Emerald

Nowadays Gardevoir is a dual Psychic/Fairy-type Pokemon, though back in the Generation III games the elegant creature was solely a Psychic-type. Of course, this influences the best moveset for the mon.

Gardevoir (Pokémon GO): Stats, Moves, Counters, Evolution

Gardevoir: Best Moveset, Weaknesses & Counters, Stats, and Evolution

What would be a good moveset for Gardevoir? What about EVs? I was

Gardevoir - Ultra Shiny / Normal / Egg -Pokemon Brilliant Diamond

what to replace for psychic? : r/PokemonEmerald

In Pokemon Emerald, I'm struggling to beat the elite four with

Move recommendations for Gardevoir? : r/TheSilphRoad

Mega Gardevoir (Pokémon GO): Stats, Moves, Counters, Evolution

Which is better in Pokemon, Gallade or Gardevoir? - Quora

Mightyena Gen 3 Best Moveset - Mightyena Best Moveset Moves