This can depend on the player. For some, playing flash games can be the easiest. For others, you may earn a trophy in seconds by playing Cheat!, Cell Block, Sahkmet Solitaire, etc. There are also some trophies players automatically get when joining neopets (the lutari talisman), and if you join Premium, which costs real money. Also, many people are great at feeding Kadoaties. Feeding just one will earn you a shiny, bronze trophy on your lookup.
Really, it depends on what games you're good at. But for me, and for most people, it's Kass Basher.
there aren't trophy locations
Well that's not a good thing... First, you can contact the Neopets team. But before you do that, check to see how many times you have beaten Punchbag Bob. You only get a trophy the first time you beat him.
well there are a few ways but the easiest are the wheel of exitment and the wheel of misfortune
You get yourself the warm feeling of making a Kadoatie happy and a shiny trophy displayed on your UserLookup. :)
Sonic's Ultimate Genesis Collection
The easiest way is to buy from user owned shops for usually about 99,999 NP
Random events, morphing potions, adoption pound, or the easiest way, on tonu day.
unlock all other trophies in a game
Wait for Poogle day and you might be able to make a Poogle pet.
The easiest way to make money on neopets it making sure to do the dailies, you can find all of those at sunny neo.com. Also making sure not to have an over priced shop but enough to make a profit and playing key quest really helps out a lot.
About a day or two. TNT won't tell you if you didn't win, but if you do, they will tell you that you won a trophy, and if there is, an avatar.