Acheops down the road
The first thing is how good could he be? He was horrible once last half health in the games but in PoGo I don’t think he’d need any nerfs for the most part.
The second is if I did the calculations right (probably not) his stats would be
293Atk - 139Def - 150HP
That would make him probably second to Rampardos in DPS but that all depends on movesets
Obviously all of this is so far away, we don’t even have Gen 4 yet but Gen 5 has fewer meta Pokémon but also some very good specific ones at that
Answers
Well rampardos is a full in physical attacker in the main games but because its speed's below 75, it gets a sped mod cut, Archeop's is mixed, its a glass cannon with high speed, reaping the benefits of its higher speed plus its higher special attack might actually push it over into being better
Pre speed mod and other modifiers, the X*7/8 and y*1/8 for both are, Archops has 136.5 atk, and Rampardos has 152.5, but with a speed of 110 and 58 respectively, I dont know how the sped mod calculations work out
SpeedMod = 1 + ([BASE_STAT] - 75)/500
For Archeops this gives it a speed mod of 1.07 and for Rampardos a speed mod of 0.966.
EDIT: To elaborate, stat calculations are as follows:
Stamina = [BASE_STAT] * 2
Attack = ModifiedAtk * Speedmod
Defense = ModifiedDef * Speedmod
ModifiedAtk = 2([BASE_GREATER] * 7/8 + [BASE_LESSER] * 1/8)
ModifiedDef = 2([BASE_GREATER] * 7/8 + [BASE_LESSER] * 1/8)
SpeedMod defined above. [BASE_GREATER] Is the higher of the two stats in question between physical and special attack or defense, depending on the stat being calculated. [BASE_LESSER] is the lower one. Pokemon with the same base physical and special attack/defense are easiest to calculate since you just double the stat them apply the speed mod. The speed mod basically buffs/nerfs the attack and defense by 5% for every 25 points of deviation from 75.
Archeops can learn the coveted Rock Throw+Rock Slide moveset from level up in the main series which would top any Stone Edge movesets. The other interesting thing is that he can actually learn Wing Attack+Sky Attack which would potentially make him the highest DPS flying attacker for almost all gens barring any new moves added by then