Well, how many items are you trying to transfer over? Five, ten, a hundred, a thousand?
The method would be determined by how many items you have.
If you have under ten items, I'd just send them over using the Neofriend method. Knowing you've been AB'ing and want to transfer stuff from an account that you raided, I'd like to assume you've got a few hundred items at most to transfer.
So you'd have a few options to send items over.
1.) Send a few items over through Neofriend method at a time. Wait a few days, send some more. Rinse and repeat.
2.) Trade method. Set up some junk trades on your new main, and send the items over through the trades. Can be caught, but it's not likely in my experience.
3.) Shop method. Stock up the items you wanna transfer over on your accounts into their shops for the accounts they're currently on. Price the items LOW. All under 1k. I mean dirt low in case you don't have the NP's, or just wanna save a few thousand when transferring the items over.
Stock them into your shop, switch accounts/proxies, and grab the items from the account. I don't recommend stocking commonly searched items like PB's, Maps, Codestones, etc. Other people will find them very quickly, and they'll see the rest of your items.
As for the Baby Kougra, you've got two options.
1.) Send that mother fucker over to your new main and YOLO the shit out of it.
2.) Keep it on the account it's on, or move it to an account that could be used as a side account. And link it to your main for X amount of time. After X amount of time (typically a few months), go ahead and move it over to your main.
I wanna mention that almost no pets have caches now (to my knowledge). This includes active pets, and inactive pets.
The slower you are to send items over, the safer you are.
The longer you wait to send the Kougra to your main while having it linked to your main account, the safer you are.
If you want more specific details (time frames, or you want more details for however many items you have), send me a PM. I'll give you my personal opinions on how you should go about it.