This will give you a nice bp boost early on and can also greatly increase your stats.
Eevee is the best one to get since it gives +10% damage to the whole team.
How Does It Work
Each pet can have 4 attributes that will make your team stronger.
ATK down and HP down are the best ones to get, damage reflection is also good, the fourth one can be whatever you want.
When you reach level 75, you will get 1 egg for free. Your pet will have 1 attribute, in order to get more attributes you will have to transfer them from other pets.
You will need to buy new eggs with coupons to get more eggs.
Transferring Skills
By using inheritance rings which (circled in red) and then choosing the skill you want to transfer to your eevee from another pet you hatched, you can give your eevee a new attribute.
Room Upgrades
Keep wallpaper, floor, mat and foodbowl at around the same level, since the BP/five-color stone is around the same, as long as you keep them at same level.
Accessories
Total +170% stats, for a total of 1594 coupons
