Flag glitch

Miscellaneous glitches of Pokémon Diamond and Pearl, Pokémon Platinum, and Pokémon HeartGold and SoulSilver

Exclusive to Diamond and Pearl:
Battle Barry every day | Broken escalator glitch (Japanese only) | Choice Banded Pursuit glitch (Japanese only) | Choice Banded U-Turn glitch (Japanese only) | Dress up Hiker glitch | Egg determination glitch | Fake Tower Tycoon glitch | Honey/Sweet Scent shop glitch | Mute Route 214 glitch | Mute Sendoff Spring glitch | Protect oversight

Exclusive to Platinum:
Ace Trainer battle loop (Japanese only) | Giratina Origin Forme glitch | Trapping Ability flee glitch

Exclusive to HeartGold and SoulSilver:
Boulder push glitch | Water stream glitch | Floating walking Pokémon glitch (poison variation, menu variation) | Sequence breaking

In various or all entries:
Acid Rain glitch (Platinum/HeartGold/SoulSilver) | Grass glitch (Diamond/Pearl/Platinum) | Global Trade System glitches | Incorrect sprite for the Defog HM (Diamond/Pearl/Platinum) | Pal Park daily limit oversight | Pal Park nickname glitch | Route 224 tile oversight (Diamond/Pearl/Platinum) | VS Recorder audio glitch

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The flag glitch is a glitch in Pokémon Platinum that allows the player to have his or her Secret Base flag appear a level lower than it actually is.

Procedure

1. Level up the Secret Base flag.
2. Exit the Secret Base.
3. Reenter the Secret Base with the door open.

Notes

This glitch has not yet been tested on Pokémon Diamond and Pearl.