Why are there different Tackles?

Question

Sometimes I see that on a some Pokemon Tackle is like 50 power 90 acc or 35 power 100 acc
Why is that?

Answer 1

That's because Tackle has changed in power between generations. It's 50 in generation 5, but 35 in previous generations.

It's also possible that the 35 was referring to the power points (pp), but since the accuracy was also changed, it's most likely the first thing I noted.