It is easy enough for a kid to play through and beat, but has the depth of a competitive RPG. It is a good mix. Also just because you are an adult doesn't mean you aren't a n00b at pokemon. At the pokemon regional tournaments there are tons of n00bs in the senior division which get completely owned by the 4 smogon players that show up.
Game freak did a great job at making an accessible game. The populous view is that it is a kids game, which is why many older players are hesitant to mention that they still play pokemon even if they are a top notch competitive player.
95% of gamers don't know they are noobs, the 5% who do won't be noobs for long
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