>>55414030>Gen 1: Fire RedYou will be missing the ones only available in LeafGreen. The Slowpoke line especially, they're only available in LeafGreen out of all the gen 3 games.
>Gen 2: Heart GoldYou'll be missing the Ledyba and Teddiursa lines, and Delibird and Skarmory. Fortunately gen 4 still has online trading. Ask in the wi-fi general for the missing mons and you might get someone willing to help you.
>Gen 3: Alpha SapphireYou'll be missing the Seedot line, as well as Mawile, Zangoose, Solrock, and Groudon. Fortunately the GTS still exists here, so you can get most of those fairly easily.
>Gen 4: PlatinumYou'll be missing the Stunky and Glameow lines. Same rules apply as HeartGold above; Stunky is only found in Diamond and Glameow only found in Pearl.
>Gen 5: Black 2You'll be missing the Petilil, Solosis, and Rufflet lines, as well as Zekrom. The Forces of Nature are also only available from Black/White 1, or from Dream Radar. Same rules apply as the gen 4 games.
>Gen 6: XYou'll be missing the Spritzee and Skrelp lines, as well as Yveltal. Has GTS.
>Gen 7: Ultra MoonYou'll be missing the Alolan Vulpix line, as well as Turtonator, Passimian, Solgaleo, and the Sun/Ultra Sun Ultra Beasts: Buzzwole, Kartana, and Blacephalon. Has GTS.
>Gen 8: SwordYou'll be missing the Galarian Ponyta and Galarian Corsola lines, as well as Appletun, Eiscue, female Indeedee, and Zamazenta. Has GTS. You also only get one choice for Calyrex's mounts.
>Gen 9: ScarletYou'll be missing Ceruledge and the Violet Paradox Pokemon: Iron Treads, Iron Bundle, Iron Hands, Iron Jugulus, Iron Moth, Iron Thorns, Iron Valiant, Miraidon, Iron Boulder, and Iron Crown.
