Runes of Magic US / AU

Aptitude isn't any harder to get up later, but I believe most say get your aptitude up to max as early as possible because you will end up with higher attributes at the end by doing so. I cannot myself say this is a fact, but I always raise aptitude as soon as possible just to make sure. Don't forget blue rune eggs to merge also for aptitude. You will get 1/4 of the difference between current pet aptitude and the blue rune pet eggs aptitude in increase.

Try... RomWiki - Magic Pets that will have answers to most of the questions you might have about pets.

Wiki is not that informative. I would recommend guide section and Newbie Guide for Pets, but I can't. I am the one who wrote it (well, cleaned, expanded and updated someone else work), so it'd be self promotion.

As you were told, it is not harder to raise later, it is just more productive to do the other way. Think about it this way. You have a child who does not have good study habits. You leave him alone, and by the end of high school, he picked up some study habits along the way. Still, he didn't learn all that much in earlier grades and even if he can study well now, his knowledge base suffers because he missed a lot of learning in early grades. But if you could make him develop good study habits early, before he enters 1st grade, by end of high school, he will know lots more. That's what you want.

The best way to do it is with training points, yes, converted to aptitude via the potions. But you want to do it without increasing levels. That is where chain merge comes from. Essentially chain merge is reliance on a fact that standard food pet gives you 50 training points, but you can increase that number on your food pet. Then when you feed that pet to your main pet, all the training points that food pet accumulated will be added to your main pet, without giving him too much XP.

Quoted from "totovandam"

so basiclly the final state outcome will not differ if i raised it at high lvl

Correct. There was a time when there were posts FULL of the mathematical breakdowns on everything to do with this game, pets included. Those were all lost in the great forum blund...uhm...changeover...switch...reworking!, yeah that's what I was going to say... Anyways, you can start with a level 50 pet, or a level 1 pet and the end results will be the same. Anyone who says differently is a parrot and just quoting what someone else has told them without doing any actual research themselves (and trust me you WILL hear it a LOT in game and here on the forums - I still get told this in game and I was one of the ones doing the mathematical breakdowns with about 3 other guys). And since he won't self-promote, Rusty is very well educated in the realm of pets so I would recommend reading his guide...if it wasn't lost as well...