Okay, you've completed the game, but there are still low-level Pokemon in your PC that you've been meaning to evolve. So what's the quickest, most expedient way you use to level up these weak creatures?
For me, I take them to the Ace Trainers just north of the Resort Area. The guy has a lvl. 55 Dusclops and a lvl. 56 Salamence, while the girl has a lvl. 55 Mighthyena and a lvl. 55 Kirlia. I keep a Metagross and Magnezone on my team that both know Explosion. You see where I'm going with this. After the fight, it's easy to heal your exploders without wasting Revives because the Pokemon Center is conveniently located. I also went out of my way to get a Lucky Egg from a wild Chansey, because those goodies give you 50% more experience, just like a traded Pokemon.
For me, I take them to the Ace Trainers just north of the Resort Area. The guy has a lvl. 55 Dusclops and a lvl. 56 Salamence, while the girl has a lvl. 55 Mighthyena and a lvl. 55 Kirlia. I keep a Metagross and Magnezone on my team that both know Explosion. You see where I'm going with this. After the fight, it's easy to heal your exploders without wasting Revives because the Pokemon Center is conveniently located. I also went out of my way to get a Lucky Egg from a wild Chansey, because those goodies give you 50% more experience, just like a traded Pokemon.