Sub Section: Which Pokemon
While I assume a lot of you are looking into getting perfect IV pokemon, the truth of the matter is that without headstart pokemon (read: pokemon with at least 3IVs), it will be very hard to actually get to the point where you reach that goal. Because of this, I urge you to take a look at the final evolution of the pokemon up on the wiki and see its base stat distribution before deciding to actually breed something.
Base stat totals/Typing
Now, if you're on the wiki, you'll notice that every pokemon has a base stat total. The base stat total is exactly what it sounds like: the total of all the base stats of the pokemon added together. The BST is a good way to gauge a pokemon's overall strength. The base stat totals between a pokemon's evolutions are different. This is the reason why you feel like you get a massive strength boost when you evolve a pokemon!.
In general, a higher BST will usually result in a stronger pokemon overall.
Due to this principle, even if you really like a pokemon, please realise that there is a very good chance it will not be worth IV breeding for due to its base stat total.
A similar sort of thing also applies to typing. While a pokemon itself may have a nice base stat total, the way it's typed may not be the most viable unless you have a specific idea of how you want to use it. In general, the most resistances and the less weaknesses a pokemon has, the more viable they are, even with their lower stat totals (looking at you Tracton).
If you don't care about raw potential (which a lot of people clearly don't based off the love for eevees despite their sub-500 base stat total) and just want to make your weaker pokemon viable, IV training can actually push said weaker pokemon to the level of non-IV trained strong pokemon. If you are willing to invest the hours for it (or just beg one of us breeders who decided to invest the hours into it), I won't stop you.
In general, a higher BST will usually result in a stronger pokemon overall.
Due to this principle, even if you really like a pokemon, please realise that there is a very good chance it will not be worth IV breeding for due to its base stat total.
A similar sort of thing also applies to typing. While a pokemon itself may have a nice base stat total, the way it's typed may not be the most viable unless you have a specific idea of how you want to use it. In general, the most resistances and the less weaknesses a pokemon has, the more viable they are, even with their lower stat totals (looking at you Tracton).
If you don't care about raw potential (which a lot of people clearly don't based off the love for eevees despite their sub-500 base stat total) and just want to make your weaker pokemon viable, IV training can actually push said weaker pokemon to the level of non-IV trained strong pokemon. If you are willing to invest the hours for it (or just beg one of us breeders who decided to invest the hours into it), I won't stop you.
Battle Role
Different pokemon have different base stats, and thus, are far easier to fight into different roles.
Yes, I know, you want cool looking pokemon, but the thing is a lot of the time, some really cool-looking pokemon have really mediocre or ill-fitting stats for current purposes!
A prime example of this would be the final evolution of Orchynx, Metalynx. Yes, it's a super cool metal cat, but you take a look at is base stats, you'll see that it's actually designed to be a tank. Because of this, it has an extremely mediocre speed!
Yes, I know, you want cool looking pokemon, but the thing is a lot of the time, some really cool-looking pokemon have really mediocre or ill-fitting stats for current purposes!
A prime example of this would be the final evolution of Orchynx, Metalynx. Yes, it's a super cool metal cat, but you take a look at is base stats, you'll see that it's actually designed to be a tank. Because of this, it has an extremely mediocre speed!
What does all this mean? It means that even if you had a Metalynx with a perfect IV in speed, had a nature that boosted speed and trained for 252 EV(maximum amount) in speed:
METALYNX WOULD STILL BE SLOWER THAN A INFLAGETAH OF THE SAME LEVEL AT ITS WORST POSSIBLE SPEED!
Does this mean a perfectly built speed Metalynx is worthless? No, it does not. It does however mean, that you will almost always been out-sped by anyone who decided to actually pick a proper pokemon for the role, so please think carefully about everything to do with a specific species of pokemon before committing to breeding!
If you're not careful, you may be investing things like nature and EVs in a dump stat for that pokemon!
This same principle applies to move set! If you give a pokemon with high sp.atk all physical moves, the moves will do damage off the atk stat instead of the sp. atk stat!
METALYNX WOULD STILL BE SLOWER THAN A INFLAGETAH OF THE SAME LEVEL AT ITS WORST POSSIBLE SPEED!
Does this mean a perfectly built speed Metalynx is worthless? No, it does not. It does however mean, that you will almost always been out-sped by anyone who decided to actually pick a proper pokemon for the role, so please think carefully about everything to do with a specific species of pokemon before committing to breeding!
If you're not careful, you may be investing things like nature and EVs in a dump stat for that pokemon!
This same principle applies to move set! If you give a pokemon with high sp.atk all physical moves, the moves will do damage off the atk stat instead of the sp. atk stat!