Basically, Anabel is in Alola because in the Battle Frontier of RSE had an invasion of an Ultra Wormhole made by tests of the Mossdeep Space Center, then by being destroyed by the Ultra Beast, in the parallel universe they are deciding to build, what happens in ORAS at Battle Resort, then during the invasion, Anabel entered the Ultra Wormhole to escape and as she appeared in Alola fainted and with little memory, is to think that she spent a lot of time in Ultra Wormhole.