Lol classic Glitch : Missingno from pokemon red and blue ( and maybe green...? havent tested it )
Teh Classics!
You know talk to the old man then fly to cinnibar and surf up and down the east coast
Anyways : Real glitchy thingy
Pokemon Daimond / Pearl
(yes it did require a AR to get to)
So you walk around with the " every pokemon is 100 " glitch , and hold down Select and L + R
You'll find a shadow with a inch over to it a white block thats shiny , and makes the bulbasuar cry. The glitch is also mostly off-screen.
DO NOT CATCH.
If you attack it will say " there is no target..." and you'll go back to the world.
If you
catch it , it will take up the space in your party/destroying your pc box.
If its in your party , because its technically
nothing you cannot move it or do anything.
It will be there forver , and no pokemon can use the space , limiting you to 5 total pokemon.