Also, if you do take PeterHolmes’s advice, make sure that Gengar has levitate ( don’t mega evolve ) and also make sure that Scizor has Technician + 252 Attack EVs.
I will try to explain EVs and IVs to the best of my ability.
EVs and EV Training
Think of EV Training like going to the gym. Different activities improve different features of you, like doing sit ups increases your leg strength, lifting weights increases your arm strength, etc.
In the world of Pokémon, your “features” would be EVs and the “activities” would be defeating Pokémon. Certain Pokémon increase your Speed EV, some increase your Attack EV, some increase your Special Attack EV, and so on, but they only increase these after you defeat them.
Each Pokémon has an EV yield, which is how much they increase your Pokemon’s EVs after you defeat them. For example, after defeating a Sawk, your Pokémon gets 2 Attack EVs.
Pokémon can also hold certain items that make EV training faster, like how if you hold weights while doing sit ups, it will improve your leg strength more.
The maximum amount of EVs that a Pokémon can have is 508. The maximum amount of EVs a Pokémon can have in a single stat is 252, similar to how if you keep training your arm strength, at a point, it will just stop improving. Or like a limiter in One Punch Man. (if you don’t watch OPM just ignore that lol)
Now, you might be wondering, what do EVs even do, and why are they so important?
For every 4 EVs that your Pokémon has in a stat, it gains 1 stat point in that stat if the level of the Pokémon is 100. This might not seem like much, but remember that the maximum amount of EVs in a stat is 252. If you divide 252 by 4, you get 63, meaning if a Pokémon is fully EV trained in a single stat, it will gain 63 extra stat points in that stat, which is huge. This also means that if a Pokémon is fully EV trained (has used up all 508 EVs) it would add 127 to its Base Stat Total.
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IVs
Think of IVs as genetics. If your parents are muscular, you will be quite muscular as well. If your parents are attractive, you will be quite attractive as well.
This means that there are no ways to change the IVs of Pokémon (except IV stones which change genetics in this game and shouldn’t exist lol), but there is a way to control what IVs a egg will have when it hatches, which can be found here.
A Pokémon can have a maximum of 31 IVs in a single stat, meaning that the max IVs a Pokémon can have is 186
1 IV = 1 Stat Point. This means if a Pokémon has max IVs in a stat, it would gain 31 Stat Points in that stat. This also means that if a Pokemon has max IVs (31 in each stat), it would have 186 Stat Points added to its Base Stat Total.
Keep in mind that IVs are in no means necessary to have a good Pokémon and are usually only bred for competitive use. I’m only mentioning it for the sake of explaining.
idk if you will even read this because its too long but whatever lol
Edit: just realized that there’s already a much better and shorter explanation here but ill leave this up anyways because I worked hard on it 