Stadium/Sea Cup/6

Reward:  2 and 32000

Strategy: At first use Soccer Lv11 with Nuclear Hit (3168 Damage) or Pirate Lv14 with Leech (3078 Damage) to defeat Ice Cream. Pure Sea doesn't have a weakness to Cool Fire and it can use Head Butt (5670 Damage) or Storm (7560 Damage) so avoid using Cool Fire. You can use Gummy Lv15 that knows Tesla Ray (6120 Damage) to defeat Pure Sea in two turns (Pure Sea can't defeat Gummy Lv15 in one hit so don't worry). Use Petroleum Lv16 with Ghost Cloud (4158 Damage) to defeat Seashell.

If you use Pure Elementals, at least have Pure Metal Lv9 with Rust (3024 Damage) to defeat Ice Cream, and Pure Flame Lv14 with Nuclear Hit (4104 Damage) to defeat Seashell. For Pure Sea, any Pure Element Dragon (except Pure Sea) at Lv16 can defeat it with their strongest element attacks (no need training).