My idea is to embed a Qi charging receiver in the foot of a plushie. I'm trying a ZigZagoon for starters. Qi charging stations are everywhere now: I even have a desk with one built-in (see the picture).
The Qi receiver will power a low-energy bluetooth arduino, speaker, and a servo or two. Paired with a nearby computer or phone, and configured with IFTT, the ZigZagoon will growl or move to alert me to different things.
Current Status: I just got an AdaFruit "Universal Qi Wireless Receiver Module", and am going to test its output and see how well it fits into the plushie.
:-) That can be a little tricky. Amazon does carry official Pokemon plushies.
The biggest challenge is finding one that (1) has room in its foot for the Qi receiver, and (2) has some appendages that can be moved around a bit. So Slugma's my backup - that big wide circular pod has plenty of room.