The perfect regional variant that i haven’t seen anyone mentioning it.

Regional Tentacruel - Based on the Portuguese Man O’War

The name man o' war comes from the man-of-war, an 18th-century sailing warship and the animal's resemblance to the Portuguese version (the caravel) at full sail.

Would fit perfectly since exploration themes and motifs are present in the trailer and gameplay that we’ve already seen.

While i’m at it…

You can find 1/3 of all Cetaceans in the world in Portugal, so please, about time Gamefreak gave us a dolphin pokemon, i know Japan has a bad history with dolphins so this might be unlikely to happen, but at least give us a decent whale pokemon.