Sanrio Timenet (サンリオタイムネット) Catch 'Em All Guide: 130-132 Erebi/Erebian/Erebistar (Future V)

Erebi is one of the starters of Mirai-Hen (Future Version). To get Erebian, evolve at Level 24. To get Erebistar, evolve Erebian at Level 37.
Alternative methods: You can purchase Erebistar at Level 1 at the Game Center for 10000 points in both Past and Future Versions, but for Future Versions it won't appear in the Future World (the default).