The party, the PC boxes and the release animation drew an egg with the icon
of the species it will hatch into, so a Pichu egg showed as a Pichu. pret's
party menu picks the icon from GetMonData(MON_DATA_SPECIES_OR_EGG), which is
SPECIES_EGG for any egg (pokefirered/src/pokemon.c:3245, party_menu.c:2655).
Pokemon.speciesOrEgg does the same, and the icon call sites use it. The
species pass only extracted icons up to NUM_SPECIES - 1, so the egg extractor
now also bakes gMonIconTable[SPECIES_EGG] as pokemon/icons/412.rgba. Cache
version 114 re-imports existing caches so the icon appears.
thibautbus