Trapping Ability flee 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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Bulbapedia also has an article about Trapping Ability flee glitch.

Here Arena Trap's message is erroneously for the wild Pokémon on the right instead of the wild Pokémon on the left. This Pokémon was fainted and is no longer on the field, so the game regards it as a Bad Egg instead.

The Arena Trap/Magnet Pull/Shadow Tag flee glitch is a glitch in Pokémon Platinum, which occurs during Double Battles (then only possible via a Stat Trainer) when attempting to flee from a non-fainted wild Pokémon on the left side with Arena Trap, Magnet Pull (when the user's Pokémon is a Steel-type Pokémon) or Shadow Tag.

If the right-most Pokémon has not fainted, the game will state that the player cannot escape due to that Pokémon's ability rather than the Pokémon on the left side.

If the right-most Pokémon has fainted, the game will state that a wild Bad Egg prevents escape instead.

Activation

This glitch may not be a natural glitch due to a lack of a means of encountering or giving the wild Pokémon available in Stat Trainer Multi Battles Arena Trap, Magnet Pull or Shadow Tag.

However, the glitch is possible with Arena Trap (and likely Magnet Pull, unconfirmed but confirmed with Dugtrio hacked to have the ability) if a Dugtrio (and likely Diglett, Trapinch) with Skill Swap is created using the Mimic Transform Rage glitch.

Credits

• Schiffty (documentation via a randomizer ROM (2014))
• ChickasaurusGL (further research, video (2018))