We have been discussing for a long if those weird pokemon powered by fiery flames/equiped with electric engines were the real deal or that was just an idea, but truth and ideals overlap and they actually represent past/future words set in a present parallel from ours, their themes and history are contradictory, their old/modern now simply doesn't make sense from our point of view.
Look:

>Bach in year of the lord 2010-2012, Pokémon White world
>wants to know what will be of his child Thyme, so builds a machine connected to the future, which needs energy from a Pokémon from Pokémon Black's world, in a timeline where Unova's themes are more advanced

>Sada a decade later, Pokémon Scarlet world
>wants to bring the glory of the past to the present, so builds a machine that captures Pokémon from other world, a timeline where Paldea is straight up prehistoric

>Thyme in year of the lord 2010-2012, Pokémon Black world
>wants to replicate his father's, Bach's, achievement, but building a machine to reach the past, which needs energy from a Pokémon from Pokémon White's world, in a timeline where Unova's themes are more traditional

>Turo a decade later, Pokémon Violet world
>wants to bring the advancements of the future to the present, so builds a machine that captures Pokémon from other world, a timeline where Paldea is straight up futuristic

Like crystals split light into any of the possible colors, Terapagos splits reality into all possible worlds, such as the blazing true old world (White) where Zekrom defeats Reshiram , the shocking ideal new world (Black) where Reshiram defeats Zekrom, the prehistoric present (Scarlet) where Koraidon comes from or the futuristic now (Violet) inhabited by Miraidon.
These worlds, all truthful, all unreal, all paradoxical, split infinitely and just like Terapagos can make pokémon tap into any possible elemental power there is, it can make any reality shift into another, no matter how fantastical it may seem.