this is a rather solid sun team. like any weather team, most of the stuff that plagues you will be most effective when they catch you without sun up (which can actually be quite a lot). you're incredibly weak to rotom-s especially if probo is removed early / SR is prevented from going up; it outspeeds every single one of your pokemon bar victreebel regardless of sun, and it outruns victreebel outside of sun as well. i wouldn't really say that probopass is a good counter for it either especially considering rotom-s can volt switch out of it and send in something else that puts pressure on probo. a simple combination of rotom-s + cb sawk or another hard hitter shreds through your team, as you have nothing that can actually switch into something like cb sawk (it 2hkoes all of your resists). in a similar manner, +2 gorebyss absolutely runs over your team if you give it the opportunity to set up, aka locking yourself into any move other than wild charge with emboar since it lives every other hit and can boost up.
i'd like to suggest a specially defensive volbeat
> probopass. imo, it's actually more reliable than probopass at setting up sun thanks to its priority sunny day, and it also acts as a failsafe for stuff like rotom-s and a boosted gorebyss with priority thunder wave. you don't lose your "slow volt switch" into your sweepers either, since volbeat can also utilize a slow u-turn to bring stuff in if needed. encore can also give your team a potential set-up opportunity with victreebel or something and seal you a game. you do lose natural bulk and sr with the exchange, but i don't think either is incredibly necessary for a sun team while the ability to set up sun or paralyze something in a pinch is really very useful. also, bumping exeggutor's nature to timid
allows it to outspeed all gorebyss (at +0 and at +2 in sun) and rotom-s. the power difference doesn't net you any specific KOes iirc, so you really don't lose much by switching from modest to timid.
@ heat rock | prankster
careful nature (+spD, -spa) | 248 hp / 8 def / 252 spD
sunny day / thunder wave / encore / u-turn
> modest on exeggutor
hope i helped a little bit and gl with your team in the future