>>41600840Worth noting that HGSS has ~450 catchable Pokemon without even trading or transferring from Sinnoh or Gen 3, more than what Sword and Shield has even with the 30-some transferrable mons.
Even though the Johto dex includes only 256 before beating Lance, there's far more to catch within the games. In general 400 or so mons is the standard, without transferring or trading BW2 alone is somewhere around 490 despite having a dex of 300, even taking into account the death of Dream World, during the time it was alive there were more.
So even though these games only have about 400 natively, they've still got way more to do in them.