some of the counters in the counter section seem a bit incomplete and could add a few more; here's what i've thought:
Venusaur: gengar is a reliable counter for the standard venusaur, if the sleep has been absorbed, as sludge bomb/razor leaf hits NVE, and gengar dents it with ice punch. Hp fire doesn't exactly hurt it and hp ghost is rare
Charizard: The counter section for charizard doesn't give any specific counter. imo, suicune, milotic, swampert and gyarados are the most reliable ones, and to an extent, salamence (watch out for rock slide) and arcanine work (intimidate + Extremespeed for the bellyzard)
Magneton: Salamence is not a good counter, as it gets 2hko'd by thunderbolt and doesn't exactly take thunder waves. Flygon is much better at doing it, as hp ice isn't that common on maggy
Tyranitar: just a suggestion, i think the counter section should be separated into "boah counters" and "physical tyranitar counters", as they are all together, even though tyranitar has a lot of variety
Flygon: Porigon2 is an awesome counter; tracing levitate and being able to ohko with ice beam
Regice: The counter section for it looks like charizard's: you could add Metagross, Snorlax, Registeel, Machamp, Hariyama to the list
That's all i can think for now
Venusaur: gengar is a reliable counter for the standard venusaur, if the sleep has been absorbed, as sludge bomb/razor leaf hits NVE, and gengar dents it with ice punch. Hp fire doesn't exactly hurt it and hp ghost is rare
Charizard: The counter section for charizard doesn't give any specific counter. imo, suicune, milotic, swampert and gyarados are the most reliable ones, and to an extent, salamence (watch out for rock slide) and arcanine work (intimidate + Extremespeed for the bellyzard)
Magneton: Salamence is not a good counter, as it gets 2hko'd by thunderbolt and doesn't exactly take thunder waves. Flygon is much better at doing it, as hp ice isn't that common on maggy
Tyranitar: just a suggestion, i think the counter section should be separated into "boah counters" and "physical tyranitar counters", as they are all together, even though tyranitar has a lot of variety
Flygon: Porigon2 is an awesome counter; tracing levitate and being able to ohko with ice beam
Regice: The counter section for it looks like charizard's: you could add Metagross, Snorlax, Registeel, Machamp, Hariyama to the list
That's all i can think for now