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While its possible they are also getting it from Bulbapedia, it seems more likely they would be using a resource in their own language and perhaps that one is better sourced

Decatron has an optional effect, so you are not allowed to activate it in this scenario

as easy as that

Being an 8-Star monster, Des Gardius has a specific summoning condition: players need to tribute two Monsters and ensure at least one of them is the 4-Star Grand Tiki Elder or the 4-Star Melchid the Four-Face Beast. This specific summon does come with a monster capable of beating the likes of the Blue-Eyes White Dragon, Metalzoa, and even Cosmo Queen

So, if your Mega Evolution gets knocked out in Pocket, its an instant loss