I can't remember all of them, but at one time I did have over 70 MLPs I missed out on most of the Year 1 ponies. The ones I remember, and the ones I have photos with are:
Cotton Candy
Baby cotton candy
Baby blossom
Baby moodancer
Majesty, spike and dream castle
NBBE baby tiddley winks and nursery
sprinkles, duck soup and the waterfall
Mimic
2 Applejacks
bowtie
Masquerade ( I renamed her emerald)
Galaxy
Princess Primrose ( I think)
BBE Baby Sleepy Pie
BBE baby Lofty
all 3 year 2 adult sea ponies
Baby Beachcomber was the only baby sea pony I remember, but I know i had a lot more
Medley
Firefly
Glory
Powder
Baby Cuddles and the baby buggy
Megan and sundance
Pinwheel
Starflower
Baby surprise
Flutter Morning Glory
Flutter Forget me not
Once a friend came to visit from the UK and she brought me one of the babies with the wash-off diaper. Mine had an elephant. I was upset it wasn't the one with a giraffe
Spunky the camel
Sniffles and Snookums unicorn twins, another set of twins but cant remember who.
color swirl Lovebeam was the last MLP I got MIP as a child
Rainbow Windy
Rainbow Parasol
Gusty
About 30 different petite ponies and 2 petite pony playsets
I did have a Pink My Pretty Pony who was terribly over-loved
I always wanted but never got a Moondancer, flutter rosedust, Princess tiffany and Paradise Estate
I also remember this really awsome popup tent that attached to my bed, it was covered in MLPs. I had an applejack boardgame, 2 3D puzzles, MLP the movie, MLP sheets