There is no way to check right now, but there are warning signs. If it doesn't have the Kalos Pentagon, then it comes from an older game, where it was easy to hack Pokemon. If it has a big series of max IVs, it's probably hacked (ie a 6IV Metagross or a 5IV Latias).
Tufted Titmouse are regulars at backyard bird feeders, especially in winter. They prefer sunflower seeds but will eat suet, peanuts, and other seeds as well. Find out more about what this bird likes to eat and what feeder is best by using the Project FeederWatch Common Feeder Birds bird list.
1 This native of Oklahoma, Texas, and Mexico is now recognized as a separate species, but the two species will hybridize when they meet.  Another instance of titmouse taxonomical tampering is the spinning of the Oak Titmouse (B. inornatus) and the Juniper Titmouse (B. ridgwayi) out of what was once the Plain Titmouse.