Wow, the reactions in this thread are much worse than I would have thought.
This is most likely Nintendo wanting to capitalizing on the mobile MOBA market - mobile MOBAs are really popular in Asia and a lot of my Asian friends here play these types of games. They enjoy the competition but it's also doesn't take 30-40 minutes like a traditional MOBA. It's like a "I have 10 minutes to spare so I'll just chill by playing this game" kind of deal.
I think whether this game becomes popular or not depends on the gameplay - I don't really think the Pokémon name is going to carry it that much. Most people play these games to kill time or chill with friends and don't care much about the characters they're using outside of what the character can actually do (i.e. assassin/mage/dps). The gameplay seems fairly typical of what I've seen of other mobile MOBAs, though the "move learning" aspect seems quite interesting.
Of course, I don't play mobile MOBAs since it's not really my cup of tea, but I can see why people would want to play it.