From WOWHead: “Super Squirt is live for EU realms this Tuesday, the 1st of February! Super Squirt is a rare occurrence where the Pet Battle Event lines up with Squirt being active in the Garrison Menagerie. It is very rare for these two to coincide, usually only happening one or two times a year.”

Source: N4G PC World of Warcraft Super Squirt Day for EU Realms on 1st February – Level Battle Pets Quickly