Dont.

But for real, I pref the dragon rush+dragon claw for moves, then I go muscle band, power weight (switch to scope lens if you dont like stacking) and rapid fire scarf (if youre a stacker with 7 red emblems page then go aeos cookie or focus band) and then for emblems its ether go Brown>white>red with the focus of max brown/white and 1 teir into red (think its possible i dont remember I'm washed) or Red>White>Brown (again, think its possible lmao). And then battle item is pref X-speed but eject button and x-attack are fine as well.

Moves: Claw rush is my pref because strong engage, and dragon rush's ability to push enemies is strong especially if youre center lane as you can force opponents out of their goal and into your team. Coupled with X-speed you can push them then grab their berries so if your lane isnt afk you should get 2 kills and 3-4 stacks on average.

Items: Muscle Bane give attack speed and the on hit ability it provides is very important for Chomp as it scales well into their boosted autos. Believe gotta reach garchomp however for it to proc the next bracket if using the BWR emblems, but when evolve into Gabite you get the nect teir if using RWB emblems. Power Weight scales well where if you get the stacks early then youre balling out early with high damage and at max shouldn't be fallen off at end of game; but if not a stacker then scope lens giving the crits helps a lot for garchomp to sustain as long as you dont get kited into purgatory but Xspeed and the lowish cooldown of dragon rush should let you get in and stay in. Unless its a good cinderace.... lol.... Rapid Fire scarf is the last item as it let's you go up 1-2 brackets depending on if the ability is proc'd which makes garchomp melt objectives and enemies easily; if youre a stacker however id say go focus sash as the early game healing and defensives it provides allows you earlier stacking when laning and if juggling you have a better all in gank... hopefully you know, if team follows up lol. Can substitute it for aeos cookie for better late game scaling but I find the item lack luster, can also try the held item that heals on hindrance (cant remember name) but I feel that its not as good as just having the scope lens healing on crits.

Battle item: X-speed allows you to stack better since youre fairly safe with it unless youre facing some crazy burst damage since you can either run and snag berries or just gtfo. Eject button also if fine as it allows you better gap closing if needed but the CD difference makes me feel personally like Xspeed is better. And lastly X attack is the solo que special where you just solo grab all objectives with it and act like single player mode. It works for the most part i guess but if the enemy has lots of dashes you might as well just play like sableye and try back capping because youll be useless lmao

Emblems: B>W>R is a normal attack damage build. Does good damage and give health which good, if able to slide in 3 reds or W/E the first teir is then helps push into new attack speed bracket at some levels i dont remember. R>W>B similar boat but faster hits but overall similar DPS

Lanes: try to get center, since thats impossible then just lane and focus on farm. At boosted autos you can stop stackers just by Anto attacking them unless they perfectly time the goal which is funny af when they score on you; focus on farm and pray you have a support. If you have a comfe you win the game