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>pokemon game duos that are referred to by two character abbreviations: RB, GS, RS, DP, BW, XY
>pokemon game duos that are referred to by four character abbreviations: FRLG, HGSS, B2W2, ORAS, SUMO
why are sun and moon the only non-remake non-sequel games to get four letters? What makes them different from previous mainline pokemon games that warrants this?