For those in the NA region, mark your calendars! This week is the Pet Battle Bonus event, and Squirt is due to arrive May 19th.
According to this handy chart, it's the only day (so far?) where Squirt's arrival and the Pet Battle Bonus event overlap.
Time to gather up all of those Pet Treats (although these might not even be needed when facing Squirt during this event), don your Safari Hat, and get your pets ready for some power leveling.
Happy pet battling, everyone! :)