Heatran is a basic Pokemon. "Put this card onto your Active Heatran. Heatran LV. X can use any attack, Poké-Power, or Poké-Body from its previous Level". so yes. you can. as long as its heatran! source
and my knowledge.
Well actually, an ex card has the same value as a Lv. X card. So you can just put the Lv. X on a regular Heatran
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