At different sessions there are different patterns

Do you believe so?

For instance, some people believe that the Euro tends to get pumped up during London, etc etc.

I have a friend who claims that around 2 hours after London open, Yen typically gains strength for a wave..

It's likely so and that's mainly because different pairs have different volatility depending on the session, so it would make sense that the patterns would be different.

I don’t think so, yes few counter trend movements but again market follows the previous trend!