research [Gen IV] Endure and damage-reducing Berries

[MeroMero]

If a Pokémon uses Endure, is supposed to take damage equal or superior to its current HP, and happens to consume a held damage-reducing Berry the same turn Endure is used, then:

_the Enduring Pokémon won't be left with Math.floor(Expected damage / 2) HP , nor 1 HP if Expected damage >= 2 * current HP;

_but instead will be left with Math.floor(Current HP / 2) + 1 HP, or 1 HP if Current HP <= 2.

In other words this tells us that Endure, if successful, is checked before damage-reducing Berries, which is obviously a bad design.

A similar problem happens with Counter, Mirror Coat and Metal Burst (possibly Bide as well) where the damage sent back is doubled from the damage that was to be taken BEFORE damage-reducing Berries are checked (showcased here).