I believe it’ll be a pokémon that will be more useful than pikachu, as likeable and/or useable as dratini but probably, “probably” not as rare. Here are my picks.
In case it will be rare here are my rare picks.
Since I have you, what will the next legendary be? I for one believe it’ll be latias and latios and they’ll rotate after about 15-30 days like zangoose and seviper. Latias in the west, latios in the east and then they’ll switch.