Mega hyper rare

In more detail

The Pokémon TCG's product guide describes these as full art Mega Evolution Pokémon ex cards whose artwork is gold-etched and holographic. CGC's guide to rarity symbols adds that the cards are embossed in gold and show the Pokémon facing forward in its Mega form.

Its symbol is a single gold star with a black border. Rarity guides note that in the Mega Evolution era this tier has taken the place the hyper rare held in Scarlet & Violet sets, as the gold card that ends a set's numbering. Bulbapedia's examples are Mega Gardevoir ex at 187 and Mega Lucario ex at 188 in the Mega Evolution expansion. Japanese cards mark it MUR.

The product guide lists the mega attack rare, marked with pink and green stars, as a separate rarity. Check the symbol as well as the gold finish, since a plain hyper rare and a mega hyper rare are different tiers.