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>Burnet, Colress and Grimsley are from Unova
>Pokemon from Unova games can be transferred to later games
>The existence of a new timeline has never erased events from earlier gens, only changed certain details in how they happened (whether or not Red went to the Sevii Islands, whether or not Groudon went Primal, etc)
Also, if the existence of a new timeline means Unova no longer exists, then maybe Kanto, Johto and Sinnoh (the OTHER pre-XY regions) don't exist anymore either. Or maybe they're somehow exempt from that logic because they're some of your favorite regions, and the only real reason you're saying Unova doesn't exist is because you really don't want it to.
Unova is canon. The events of BW and B2W2 happened. The events in the new timeline are probably slightly different from in the old timeline, but they still took place. Deal with it.