I find that a very good training spot is near the two running black belts on One Island. Use the VS Seeker to rebattle the three trainers there. They have a Machop, Machoke or Machamp with varying levels depending on your stats. Once you defeat them, run into the Ember Spa, heal, and come back out. This is about 120 steps, just enough to charge your VS Seeker again. I used this method to evolve my Dragonite, Tyranitar, Kabutops, Jolteon, Vaporeon, and I got my Articuno, Mewtwo and Charizard to level 100 this way. A tip would also to register your VS Seeker and use the Running Shoes (hold B) to run back into the spa. It's quicker than getting on your bike.
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There are a lot of flying type Pokemon you can catch in leafgreen here are some good flying type Pokemon you should train remember you don't have to train these: Pidgeot, Fearow, Moltres, Zapdos, Articuno, Gyrados, Aerodactyl, Dragonite, Farefetch'd.
it is go use the bathroom good luck.
MoltresZapdosArticunoPidgeotHo-oh (special event)charizard
There really isn't anywhere is Saffron to "train" but if you go to the left of the city and go through the building with the cop there is patches of grass you can practice with your Pokemon ok the wild Pokemon that thrive there...then when your done..you can just go back and challenge the gym leader of Saffron..the leader is Sabrina: Master of Phsycic Pokemon.
Only if you have obtained the item, Ruby, in Pokemon Leaf Green. Good luck finding it though! I only play Ruby and Blue, classic and FREAKIN' AWESOME! ----- I believe you need both the Ruby and the Sapphire in Fire Red or Leaf Green to trade with Ruby/Sapphire/Emerald. Find these on the Sevii Islands...