I finished Emerald today. With my tagteam of female Pokémon. Ludicolo lvl 50, Magnectric lvl 48, Pelliper lvl 46, Breloom lvl 44, Lairon lvl 40 and finally Slugma lvl 30. The real stars were Ludicolo, Pelliper and Magnectric. Even despite being underleveled compared to The Elite Four and especially to Wallace the champion, they carried their weight in gold.
I’m very happy I managed to beat the Elite Four on my first attempt, without knowing what Pokémon or types they use.