Eevee the evolution Pokémon: It was belived in ancient times that it was a descendant of mew due to it’s abilities to evolve into 8 different Pokémon.

Glaceon the fresh snow Pokémon: it uses the “Helmet” on it’s head to bash it’s predators such as Tinkaton and heatmors than freezes them to eat them 

Mega Glaceon: Mega evolution energy has caused Glaceon’s helmet to form into a very durable ice armor shell that can not melt at all,

The crystals on it’s back and ears are for for curling up into a spikey ball to roll to go at higher speeds