This glitch was found last year by Anonymous guys in 2channel.
It seems hard to do it in Crystal(J).
I confirmed this glitch worked on my Game Boy Color.
So I tryed to do it on VBA(v21),but it didn't work.
There is the way of glitch.
1 Save the game before despoiting a few pokemons.
2 Choose ボックスせいり／メール はずしてね(MOVE PKMN W／O Mail).
3 Reset the game before saving.*1
4 Start the PC and choose ポケモンを つれていく(WITHDRAW PKMN).
5 There are LV 0(or 1) and glitched name pokemon(This pokemon called "0 poke" in this sentences.),but it existed non-changed LV and glitched name pokemons on VBM.
(6) Despoit "0 poke" to The Breeding Center.
(7) Walk and receive "0 poke" from The Breeding Center.
(8) Leave The Breeding Center.
(9) Press start button and open ポケモン(pokemon).
(10) Open "0 poke"s つよさをみる(STATS) and back field screen.
(11) You can see glitched field screen,and you can move freely(but it is limitted a little.) on the land.
*1
Pokemons isn't received. (Your reset is early)
Pokemons' name are glitched but not LV 0. (Your reset is slow a little)
Pokemons are cloned. (Your reset is slow.)(Above thing and this thing happened on the same time on VBA)
Pokemons are received. (Your reset is slow.)
VBM:
http://dehacked.2y.net/microstorage.php/info/172063744/wallthrough%20failed.vbm (I played on Gold rom.)
Source(Japanese page):
http://www.geocities.jp/yukihashivirtueteam/tekitokepokekingin.html
Sorry for my poor description.
