idea Gen V Walking Pokemon?

[Sirnight]

Would it be possible to program in companion Pokemon into the Gen V games, like in HGSS? I know it probably wouldn't be possible on a cartridge, but perhaps an emulator? I know every Pokemon has an overworld sprite even if they would never appear in the overworld normally, so would it be possible to somehow take the data from when NPCs follow you (i.e. Bianca in Reversal Mountain), replace the sprite, and apply it to the whole game? Walking Pokemon was one of my favorite features in HGSS, and I'm not saying interaction would be necessary, but having the little sprite following you wherever would make the games that much better. Could it be possible?

Edited July 4, 2017 by Sirnight