Find any double battlers in the region and have aron hold exp share send out aron and a really strong Pokemon beat the trainers and aron will level up quickly repeat until it evolves.
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Unfortunately the only area for good training is the Pokemon league.
The easiest way to level up is to feed Pokemon Rare candies.
abra evolves into kadabra at level 16 on pokemon emerald best way give abra the exp share and use ur strongest pokemon and go 2 the victory road or pokemon legue
It depends on the level, its moves and its stats. But if even, it'll be Giratina
Other than secret bases the best spot is the Pokemon league.