Played a bunch of Emerald lately, I will be posting some teams I used, that you can try out if you want - Here is one around Aggron and Camerupt : r/PokemonEmerald
Team Analysis: Steven Stone | Wiki | Pokémon Amino
Aggron Only - Pokemon Emerald - YouTube
Emerald hack: - Altered Emerald (386+ patch with new maps and 7th gen battle engine/evos) | The PokéCommunity Forums