Togepi needs to have happiness. Here's some methods to raise it's happiness:
Walking 256 steps, Massage, Veilstone City Massage, Ribbon Syndicate, Using vitamins, Gaining a level, and Using healing items. Also poffins will help it to upgrade.
Avoid these:
Fainting, Using EnergyPowder, Using Heal Powder, Using Energy Root and Using Revival Herb.
Then give it a shiny stone(found on iron island)and evole it into togekiss if you want.
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togetic then togekiss but what level
Togepi does not evolve at a certain level. If Togepi's happiness/friendship towards the player is at, or close to maximum, and it levels up, it will evolve into a Togetic.
To evolve Togepi, you need to make it have the highest possible friendship. Friendship points are gained when you walk with Togepi in your pack, make Togepi grow levels, or give Togepi items. Once it's friendship level is maxed out, make it grow a level and it will evolve into Togetic. You can make Togetic evolve by giving it a shiny stone on it. It will evolve into Togekiss.
It doesn't evolve at a specific level in fact you can have a level 6 togetic as long as togepi's happiness is at the max level.
Platinum: Togetic: You must evolve Togepi.