The US has been selling weapons to Saudi Arabia for a long time and hasn’t stopped even with the genocide in Yemen starting in 2014. There are 3 Presidents that are complicit in this, so he isn’t really joining the genocide just ramping up US involvement.

Would you say it’s a monument?

Hidden Power doesn’t exist in Gen 9. Although you can use Tera Blast with the appropriate Tera type to replicate that. Note that using your Tera on Heatran will also change your defensive typing for the 3 turns (?) it lasts.