A different wich one to power up Question
So, this is my Machamp team.
I am afraid I won't be able to solo him on Cloudy weather, so I can do 2 things:
-Switch my Rayquaza for a 14/15/15 C/DG Gardevoir
-Power up my Lugia to the last ES breakpoint
My Lugia is lvl 26 and the last ES breakpoint is 31,5
My Gardevoir is lvl 20 and has a Confusion breakpoint at 31
The questions are: Which one of them is a more relevant win condition vs CLOUDY WEATHER Machamp? Which one of them has more uses outside Machamp raids?
PS:
I am going to power up both of them, but right now I only have rarecandies for one.
Please don't tell me to power up Lugia first because it's 100 shiny, I know how lucky I was to get one (it is my only 100).

Answers
For battling yes. You were linked the article on breakpoints below, basically higher attack IV reaches breakpoints with fewer powerups, ie. you save stardust when getting the mon to its optimum efficiency. Likewise with def and hp IVs there're these things called bulkpoints which let your mon survive a certain number of hits. Higher IV lets you reach the bulkpoint at a lower level.
because of how the damage formula works, the damage done by a move is always rounded to a whole number, a breakpoint is where at a certain level with a certain attack IV a pokemon's fast move will do 1 more damage per use than the level before. here is GP's article on it
https://pokemongo.gamepress.gg/guide-break-points