Verified answer

You have to see the pokemon and have the name in ur pokedex before u can get them on gts. even if u trade with ppl then trade straight back it counts and u will be able to search for them on gts.

each and all the mythical pokemon got here across on diamond and pearl there is dialga which you meet nevertheless struggling with team galactic (Palkia may be on pearl version) azelf, mesprit, and uxie are got here across on the lake fronts (mesprit would be a runner) cresselia got here across on fullmoon island (additionally a runner, and you want national pokedex) Rotom would be got here across on the masion in eterna wooded area (go at night and look at t.v. yet you ought to have national pokedex) giratina would be got here across once you get national pokedex (south of veilstone city) and there darkrai yet to get that, you want a nintendo experience (never have been given one) for and different mythical pokemon you ought to commerce or migrate from different video games.

i got deowys arceres and mew