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Rescue Team is rough around the edges but has the most longevity of the games and the best fugitive arc
Explorers is the best entry overall but it did fuck up some shit RT got right already, like the IQ system, how postgame legends are handled, and player evolution
Gates is easily the weakest of the main four but its one real flaw is just the awful roster, if it had all 649 Pokemon at the time the simple goal of recruiting them all and traversing all the already existing dungeons to find them all would fill the void the game has, the player/partner selection would be better in that scenario too
Super has probably the most solid core gameplay but loses some of the appeal past games had in how it alters a lot of the general structure of the game even in areas Gates got right, personally it has the weakest story of the four too