'How to raise your Pokemon in X and Y'
To raise your Pokemon in this newest region, you will need to battle EVERY trainer on EVERY route to max out some of your training for your Pokemon. After you have defeated the Elite Four and Leader, you're going to have to find other places to train, and here they are:Kalos
1. Looker Bureau
In Lumiose City, there is a place called Looker Bureau, in Rouge Plaza. Just accept to help him and battle the trainers he tells you to fight because they will give your Pokemon some XP. I am not going to spoil it.
2. Elite Four and Leader (again)
Obviously you could battle the Elite Four and Leader again, but that's your decision if you're bored with the 3rd option.
3. Battle Chateau
This is on Route 7 past the Day-care, and you will be able to battle many trainers every day to get XP. Also, if you rank up, more trainers with stronger Pokemon will come to battle you, even Gym Leaders and the Elite Four, and when you get to the rank of Grand Duke, the Gym Leaders and the Elite Four come more often.
4. Juice Shoppe
You can also go to the Juice Shoppe in Lumiose City, Autumnal Avenue, after your Pokemon has just leveled up, as not to waste XP, and buy Rare Soda for your Pokemon to level them up, which is 20,000 Poke dollars. Everyday there are different drinks, so don't expect it to be there everyday. Use it wisely though, because the 1st time you use it, it's 3 level ups, then 2 and then 1 for the rest of the time.
Use these techniques and ALL the Pokemon in your team will be Lv. 100 in no time.
Also a good idea is to get all your party Pokemon to max affection in Pokemon Amie, this will REALLY help in battles, trust me.
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