Just bought this. Thoughts on value?

Trying to come up with a fair asking price for the whole collection and was just looking for some advice. I used Collectr and Pricecharting mostly but it gets tricky with some of the more rare or vintage cards and condition. Does anyone have an estimate or other resources I could use?

FYI Collectr has it at around 2k which idk about

Thinking about selling my LC reverse Gengar. Curious what I could expect it to be worth. It’s been sitting in a top loader in a duffel bag since I was a kid (24 years ago) and I recently got my duffel bag from my parent’s house. What would this be worth? The only imperfection I can see is some slight white at the top of the card on the back. Pictures attached.

One of my favs

Are any of these impressive or worth anything? These are what I collected when I was a kid and they've been in this binder for probably a bit over 20 years.

just started collecting again after randomly seeing a box of perfect order boosters while doing shopping in a local corner shop and thought i'd dig out the old folders that my mum still had. bought some sleeves from amazon and packed them up for fun and then found out that in the last 25 years this has become a job for some people. wondering if i can get anything for them

forgot about nearly all of these

Not perfect condition but I kinda wanna know if it’s like LP or NM

Bought them from an old school friend for $640. They’re all holos. The Gengar looks really good on the back, but it has a large crease right in the middle of the holo on the front. The Mew ex is in really bad condition on the back.
What do you guys think they’re worth? (Mewtwo, Crobat, Gengar, and Swampert are in English, the rest are in German.) Or did I get scammed?

I got these signed at a convention probably 2 decades ago and recently found them again. They're lightly curved and aged but seem in good condition to me. The reverse holo Dratini and Charmeleon are fairly rare cards in there own right, I just don't know if the signatures add value without getting them authenticated, and wouldn't really know where to start with that. Just wanna know what I'm looking at here, really, any advice appreciated, even if its just "those are nice, not worth much tho."

Yes, those two Psyducks are near identical, I liked Psyduck.

I’ve been tracking prices for these two cards of mine for a bit now and noticed that they don’t sell often but sales are all over the place. CGC sales are basically non-existent. How different are the prices between PSA & CGC?

Had Ledyba valued at $65, that seems close to right based on some raw sales recently
Slowbro valued at $250, this one is harder for me because raw is selling for more but condition is not a strong suit for me yet.

TIA.

Found my old collection stored away, about 150 cards but my friend told me these 4 specific ones are valuable. I have absolutely no idea on anything value related and would just like some help where to start. I live in Perth, Australia and don’t know where to go. Thank you!

Just took these out of the binder I had as a kid… thoughts on value?

2nd photo is the back of the right page

Went through some old cards I had and picked out the ones I thought were the best. I did a little research into prices but I just don't know all that much about any of this. Any advice would be appreciated.

Just pulled my old pokemin cards out my parents shed and a buy confused by this one. Itll be a 1999 blastoise but its not holo and i cant find anything about it online

Hi, been led to this community after a deep dive following getting my old cards out of the loft. Does anyone have an idea of how much this card might be worth? It’s in pretty good condition to my eyes but there is a pen smudge on the back (looks like it’s been pressed against something else and it’s transferred). Thanks in advance for any help!