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Probably should. Legends games are a good way of revitalizing an existing setting while spicing it up. Include some new regional forms of mons not from the region (like gen 4-10 mons), add more megas for gens 7-10 mons especially as well as a couple more for Hoenn mons (Absol getting a third mega would be kino, and giving Groudon/Kyogre/Rayquaza new ones would be neat too) and using it as a way to just do whatever we want.
For me the starters would be Sprigatito, Chimchar, and Sobble.