Mintch is the resident bird Pokémon of the Tohoak region. It has a higher stat total than Taillow with its Speed being its best stat. It's a good Pokémon to use early on in the game and has a type advantage over the first Gym Leader. It also evolves at a relatively low-level so not much training needs to be done with it.
When training a Mintch, take into account its low HP; it won't be taking hits very well and is susceptible to moves that do set damage (e.g Dragon Rage) and multi-hit moves (e.g Fury Swipes). If it has the Insomnia ability, it also cannot use Rest.
Overall, a good early-game Pokémon that loses this as progression is made. There are simply better Pokémon out there than the Mintch line.