My dd is 9, totally unhelpful for your ds but incase it helps others with dds! her main gift is going to be a hair styling head and accessories.
But making her treat boxes with all her favourite foods/things I usually say no to!
Beauty box with bath bombs/face masks/nail varnish.
A fur coat.
But pokemon wise, its quite expensive but funko are doing a pokemon advent calendar this year, you get a mini funko pop figure each day. Dds have had the harry potter ones in previous years and they are fantastic quality and good value considering their usual individual cost.
Build a bear pokemon are lovely quality (I collect them!).
Qwertee have quite a selection of pokemon tshirts but they have daily ones that change too so more might come up.
EMP have pokemon & harry potter clothing and accessories.
H&M also have pokemon and Harry potter clothes.
Harry potter wand? I bought dds some replica ones from China, surprisingly good quality and design.
The illustrated versions of harry potter are stunning.
Primark often have lots of harry potter merchandise especially in the run up to Christmas.
One year I made dd1 Newts case from fantastic beasts - I got an old suitcase from a charity shop, some cuddly nifflers, a bendy bowtruckle. Some stolen treasure (plastic diamonds from poundland and chocolate coins), a harry potter note book, pen, wand, a copy of fantastic beasts and where to find them. I cant remember what else I had in there but she loved it ❤