Glimpse, the Unthinkable's third ability prevents players from choosing the name Glimpse, the Unthinkable for spells and abilities that require choosing a card name, but it doesn't stop players from choosing the name Glimpse the Unthinkable
Orvar also has Changeling, giving it all creature types, so any tribal token strategies work with them as well
However, by paying the cost listed in the top right of the left pane in the rules text, you're allowed to cast it as an Instant or Sorcery with the name listed on the card instead
Weakness: Darkness Resistance: Fighting Retreat: 3 Pikachu VMAX - Lightning - 310 HP Pokmon - VMAX - Evolves from Pikachu V L Tail Charge 30 Attach up to 3 [L] Energy cards from your discard pile to 1 of your Pokmon
On one level, this wasn't much of a surprise, as Mega Evolution is set to be featured in the new game Pokmon Legends: Z-A
Sure, it's got good HP and a strong attack for a basic, non-Ex Pokmon, but you have to balance that against the downsides of a high retreat cost, and more importantly an attack that requires three energy to use