I used an Adamant Lurantis in my Sun playthrough, and while Lurantis is one of my Top 10 Pokémon, it is pretty terrible. Bad movepool and it's exceptionally slow, even for an Alola Pokémon. It did come through with clutch Solar Blades a few times, but that was more because of Pokémon Refresh. I love Lurantis to death, but Tsareena is much better.