This is why I dislike time travel plotlines; they become too complicated in the end.
The
Tirtouga that Fujio befriended in the past was revived from a fossil in the previous episode. This meant that it was a Tirtouga before the pokemon fossilized. The Tirtouga has evolved into a
Carracosta during this episode, and it decided to go back to its own time at the end of this episode. The pokemon would have been fossilized as a Carracosta, not as a Tirtouga. If it were to be revived in the present due to Team Rocket's machine, it would have been a Carracosta instead.
This meant that this episode overrided everything that happened during the previous episode.
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