Pokemon Gen 2 categories question

[tequekama]

I've a query for anyone worried within the Pokemon speedrun community, maybe there's some thing i'm false impression, and i might like to hear human beings's take on it.

For the runs of Gold/Silver, Crystal, and HeartGold/SoulSilver, the "any% glitchless" run ends when you defeat red, triggering the second set of credit.

To my information, normally in speedruns, any% ends while the credits are reached (for the primary time).

In FireRed/LeafGreen, any% ends when the elite 4 and champion are defeated, and credit are reached. A further class, "Elite four spherical 2" includes completing greater content material after that and attaining the second set of credit.

Why is gen 2 one-of-a-kind than this?

Why is there now not "any% glitchless" (defeating elite 4) and "defeat purple%" (or some thing like that)?