From Bulbapedia, the community-driven Pokémon encyclopedia.
(Japanese: ハニー島 Honey Island) is the first location Ash, Iris and Cilan visited on the Decolora Islands. It is well known for the Honeymitsu honey that the Pokémon make there.
Ash gets invited to partake an All-You-Can-Eat lottery which turns out to be from Team Rocket after the trio's forced arrival on the island. The lottery is an actual trap in an attempt for them to catch Pikachu, but before they can get away with their prize, a swarm of Kakuna evolve into Beedrill which causes the groups to get split into three. After finding each other, Ash and his friends manage to arrive in the Pokémon Center located on the island and enjoy the Honeymitsu honey.
Pokémon seen on Honey Island