The metric for the total amount of stats for a LR, they have been following that. All of them have above 2900 total stats, only Lowemon who does not and I don't know why. They probably made a mistake in him. I am not saying they are consistent with their releases though, I am just saying the number they have put for a LR to have and it is above 2900 total stats it seems. This is just to explain the Plesiomon situation.
There has been a lot of inconsistencies indeed like you said and I am not denying that, I agree with it!