Once Discord became a thing, this forum dried up real quick. I recommend heading over to either the official or community discord servers.

https://discord.com/invite/vnWasWa

Like every other non-breedable monster, they will randomly show up in the shop, the cells shop, or as rewards in various events. Sometimes even as breeding event results.

That link looks like it gives computer AIDS.

Sounds like your device is running 4.2? Sorry to hear about that. Of course, that version was released almost 9 years ago. Things have to stop getting supported eventually.