Leafreo

For all my Japanese DW event pokemon, I use a japanese save and PokeStock. I set the pokemon I want on entree forest and caught it in game. There is a english translation PokeStock on the forums, the program to add pokemon to your entree forest is called PokeC-Gear.

Pokegen has a tool to complete your pokedex if you want that. "Tools > Pokédex"