Age:
This is just my opinion, but 10 is a bit young for a pokemon adventure. You could boost it to 12-13, as it makes more room for history, etc ;p
Birthplace:
Not really a necessity, but please include the region in which the town of his birth exists. ;3
Appearance:
I feel, personally, that the appearance is a little plain. Are there any accessories that the character wears, and what makes these accessories special? Are there any specific designs on the character's closing, or other significance, such as rips or tearing? Give us a vivid depiction of what he looks like ;3
Personality:
Does his impressionality range only to experienced trainers visiting the farm, or does it apply to all trainers who have more experience than him? Please define this. I'd also like to see a bit more of an elaboration on his personality; could you give him a bit more depth, such as more of an expansion on how he behaves around his pokemon or other strangers? What are some of his interests and disinterests?
Battle Style:
I'm seeing something here you could include in the personality; the character is eager to learn and refine his battle style to be the best. He also seems fairly strategic given the statement about berries.
History:
1. Usually histories are written in past tense, but that's not necessarily a problem, and just insight.
2. I would like to see a bit more about Ando's history during his infancy years or at least from the age 5 and up. How did he come to meet his combee? Have his parents always been into farming, or is this a fairly recent event? What's his motivation for straying away from the irrigation and such at the start (what causes him to want to be a professional pokemon trainer, etc)?
3. You mention unsuccessful attempts to capture pokemon; you could elaborate upon this a bit by, possibly, including a couple of examples of how he failed. It could also be potential addition to state how these failures influenced his personality, such as him desiring to learn better tactics to capture / fight, etc.
4. Why were his father / mother apprehensive of his desire to be a trainer? Is it solely because he'd be alone, or are there other worries, such as passing the family farm, etc?
(You could also mention where his brothers got the pokedex. Did a professor or some other professional show up, giving one to them upon their request? Perhaps this coudl be used, also, to influence his relationship with his brothers.)
Pokemon:
If you haven't already, you can give Combee a TM/EM that it's compatible with; totally your choice