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MissingNo, a glitched Pokémon from the Generation I Pokémon games, at one point appeared as a Poké Ball summon in Super Smash Flash 2. It would cover the screen with a fake Microsoft Windows Blue Screen of Death. This character was removed due to its attack being too convincing and fooling full-screen players into thinking their game actually crashed, as well as MissingNo not officially being a canonical Pokémon.
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The Battle Cards from Kingdom Hearts: Chain of Memories were intended to appear in Super Smash Flash 2. They would have summoned characters from Disney movies, with Genie; Stitch; and Jack Skellington being named as planned summons. The item was scrapped due to conceptually overlapping with Assist Trophies and Poké Balls.
Archived Super Smash Flash 2 Dojo Battle Cards post:
https://web.archive.org/web/20111124045450/http://ssfdojo.mcleodgaming.com/index.php/category/battlecards
Archived Super Smash Flash 2 Dojo Battle Cards removal post:
https://web.archive.org/web/20120504093840/http://ssfdojo.mcleodgaming.com/index.php/2012/04/14/the-future-of-the-battle-cards-item/
https://web.archive.org/web/20111124045450/http://ssfdojo.mcleodgaming.com/index.php/category/battlecards
Archived Super Smash Flash 2 Dojo Battle Cards removal post:
https://web.archive.org/web/20120504093840/http://ssfdojo.mcleodgaming.com/index.php/2012/04/14/the-future-of-the-battle-cards-item/
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Simon Belmont was originally slated to be revealed for Super Smash Flash 2 on August 10th, 2018 during that year's Super Smash Con event. Coincidentially, Simon would be announced for Super Smash Bros. Ultimate two days later in an August 8th Nintendo Direct. The trailer for Super Smash Flash 2 would poke fun at the timing of the two announcements.
Super Smash Bros. Ultimate - Simon and Richter reveal trailers:
https://www.youtube.com/watch?v=3VrbkoWUyIg
Super Smash Flash 2 - Simon trailer:
https://www.youtube.com/watch?v=-tQrVkb97rc
https://www.youtube.com/watch?v=3VrbkoWUyIg
Super Smash Flash 2 - Simon trailer:
https://www.youtube.com/watch?v=-tQrVkb97rc
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