>>49536022There is some variance and you will get a quest that introduces you to it (Get a big Buizel) and like 0.99-2% chance of any spawned mon spawning as a Alpha which is always max size, Bidoof being common as fuck with loads of Spawn spots means you will see a few eventually.
You can actually grind for Alphas like you do Shinies i think, im trying it for Growlithe right now (Got a Shiny out of it so far since it is basically the same method, but no Alpha).