>Metagross has four brains in total. Combined, the four brains can breeze through difficult calculations faster than a supercomputer.
>Alakazam's brain continually grows, infinitely multiplying brain cells. This amazing brain gives this Pokémon an astoundingly high IQ of 5,000. It has a thorough memory of everything that has occurred in the world.
Once again, Pokedex Entry.
Now, the question is:
Which one has higher IQ? Which one is cleverer? Which one is smarter?
To answer this, we need to know what IQ means in terms of a supercomputer. How much IQ does a supercomputer have?
According to this website,
>One of the world's smartest computers took an intelligence test and scored as well as a four-year-old human being.
>The computer basically can name the dots, but can't connect them.
From here on, it seems simpler. Basically, Metagross can solve equations, but not necessarily understand them, or know them. On the other hand, Alakazam has the ability to know and remember everything in the world. Implying that not only does it know the equation that Metagross solves within seconds, but also why, and the answer, kind of before hand. Also, the Dex entry talks of infinite brain-cell generating capabilities, that, in my opinion, out-trumps Metagross without a doubt.
Also, Metagross can only analyze, meaning it would probably fail the Turing test (keep in mind, however, it does use this in battles, so it is question of whether it is acting them out as simulations, or as actual strategies. If they are merely simulations, then it is not AI, but given that it acts based on the simulations, it may be AI). Now, Alakazam, as we know, has Intelligence of its own, and acts based on strategies it creates, as opposed to Metagross, instead of creating simulations, and discarding those that aren't beneficial.
tl;dr: Metagross solves stuff, Alakazam already knows the answer.
Had to upload this genius from RareCandyTreatment :3