Your best bet is to trade.
Chat with our AI personalities
You need to complete your Sinnoh pokedex. Then talk to prof. Rowan, after your pokedex has been upgraded, Rowan will give it to you.
No it isn't cheating because that's how you complete your Pokedex in Pearl/Diamond/Platnium.
in the national pokedex it is flareon which i have finished the national pokedex in the first pokedex it is tentacool in platnium
Once you have completed the pokedex I think you should try and evolve them all and then get them all to level 100 although its impossible to complete the pokedex without an action replay
Yes.