Starmie
No.121 · Mysterious Pokémon
Starmie swims by spinning its body at high speed. As this Pokémon cruises through the ocean, it absorbs tiny plankton.
No.121 · Mysterious Pokémon
Starmie swims by spinning its body at high speed. As this Pokémon cruises through the ocean, it absorbs tiny plankton.
No.487 · Renegade PokémonLegendary Pokémon
There is one Hisuian verse that tells of a powerful light creating a deep shadow. I imagine that this deep shadow is Giratina.
No.853 · Jujitsu Pokémon
Searching for an opponent to test its skills against, it emerges onto land. Once the battle is over, it returns to the sea.
Giratina is the tallest, heaviest and strongest of the 3 on this date.
April 30 is day 121 of the year on a leap-year calendar. Divided by 366 that leaves a remainder of 121, and every Pokédex number leaving the same remainder belongs to this date. The lowest of them, No.121, is the one this page leads with.
The straightforward reading — 27 July becomes No. 727 — breaks down in November, where the numbers run past 1025 and leave those birthdays empty. Cycling through 366 keeps every date filled.