I don't think anyone knows why Paul is mean on Pokemon, he looks intimidating, but you cant judge a person by their looks and emotions... anyway Paul is just like that probably in one of the episodes it may reveal the answer that we all want to know about.
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He is so cold to Dawn because he likes her. Though Dawn likes Ash and maybe Kenny. Paul probably hates Ash because he gets to travel around with Dawn. Though, she doesn't like Paul for being cruel to Ash and Pokemon.
If you mean evolve, then keep battling with your Pokemon with other wild Pokemon or with other people in the game, so you get exp and then level up until it says, "What, so-and-so is evolving!"
The moves Block and Mean Look do not exist as TMs on Pokemon Diamond. Block and Mean Look have yet to become a TM in any of the Pokemon games so far if ever.
Honestly I think that Dawn does not like Paul and to most Pokemon fans they say that Ash and Dawn or Dawn and Gary are going to be together but honestly I don't know who is going to get Dawn. Opinion 2 - Dawn doesn't seem to like Paul all that much judging from the episodes considering how mad she got when Paul forgot her name in "A Gruff Act to Follow" so I'd say no.
You mean pokerus it is a Pokemon desige that doubles how much experience you get in battle. It is a really rare to get it. also when you have it you can put it in the PC so it can spread to other Pokemon.