A TM for Cross Poison doesn't exist.
Look here to learn which pokémon can learn it by level up: http://bulbapedia.bulbagarden.net/wiki/Cross_Poison
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You must level up Parasect, Crobat, Skorupi or Drapion to have a Pokemon that knows Cross Poison. It is not a TM.
In Pokemon Platinum, Flash is a TM.
Tm 60 in Pokemon Platinum is drain punch
TM 84 contains the move Poison jab. This TM is located on route 212. This move has a power of 80 and can poison the foe (a really nice move)
Aura sphere isn't a TM in Pokemon platinum.