>>45199350>The Isle of Man (Manx: Mannin [ˈmanJnʲ], also Ellan Vannin [ˈɛlʲan ˈvanJnʲ]), also known as Mann (/mæn/), is a self-governing British Crown dependencyBut it wholly-affiliated with the brits, which is why it showed up. Ireland isn't, there's land claimed by the brits and sovereign Ireland claiming the rest and I don't think anyone wants to get involved in geopolitics in their kids game (why I made peace with likely never seeing Ireland in the Pokémon universe).
And as for the set-up, the regi temples (minus the new) are arranged similarly in the CT as they were in Sinnoh, Calyrex' theme apparently has a Sinnoh trainer battle leitmotif (XY champion battle had a RSE Gym Leader lietmotief, for reference) none of the sinnoh mythicals, starters, fossils or regionally-introduced pokémon were added to the game with the CT update and there was a space found in the game index in home making a new title release slated for next year. You can keep thinking there's more DLC coming, but that's just looking unlikely at this stage.
