The 'strongest Pokémon in the world' is a popular topic, discussed widely even among experts in the field. In the video game, it depends a lot on how you train your Pokémon. In the card game, what's the best one? One that has a lot of HP, or perhaps a Pokémon that can deal out over 100 damage in one shot? They're usually not the same Pokémon though, so you'll have to choose whatever suits your needs.
The biggest thing to think about, in regards to what is the strongest, is looking at what kind of challenge you're facing. If you're always facing off against Fire-type Pokémon, it's often useful to look for Water Pokémon that pack a punch. Maybe you're trying to beat your friend's favorite Grass team - Fire is the way to go, if that's the case.
As you can see, it's a topic that has as many questions as it has answers. That's one of the best things about Pokémon - there's always more to learn.
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