This is not EVERY Splatoon trailer, but its the main ones.
All Splatoon trailers are shown below. Also this is not really in any particular order so some stuff might be swapped a bit.

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#splatoon #splatoon2 #splatoon3
00:00 E3 2014 Teaser Trailer for Splatoon
02:16 Wii U Splatoon Single Player Trailer
04:04 Wii U Splatoon: New Maps
05:39 Wii U Splatoon Ranked Battle, Battle Dojo and amiibo Trailer
08:05 Wii U Splatoon Extended Cut
10:48 Splatoon Squid Kid TV Commercial
11:18 Wii U Splatoon Single Player Spot
11:50 Wii U Splatoon Splatfest Incoming!
13:23 Wii U Splatoon Squid Strats
13:57 Wii U Splatoon Tower Control
14:31 Wii U Splatoon Big Splats
15:05 Wii U Splatoon Stay Fresh Trailer
16:18 Splatoon Inkredible New Stages and Gear
17:44 Splatoon New Stage Squid Dance (Piranha Pit & AnchoV Games)
19:25 Splatoon Squid Sisters New amiibo
20:50 Splatoon Callie Solo Music Video (Bomb Rush Blush)
22:16 Splatoon Marie Solo Music Video (Tide Goes Out)
23:33 Splatoon – Splatfest Splashback
27:08 Splatoon 2 Nintendo Switch Presentation 2017 Trailer
28:46 Splatoon 2 Single Player Trailer Nintendo Switch
31:14 Splatoon 2 – Nintendo Direct 4.12.2017
37:55 Splatoon 2 Off the Hook introduction
39:40 Splatoon 2 Launch Trailer Nintendo Switch
42:21 Splatoon 2 Accolades Trailer Nintendo Switch
43:07 Splatoon 2 Huge Holiday Updates! Nintendo Switch
44:51 Splatoon 2 Off the Hook New amiibo
45:31 Splatoon 2: Octo Expansion Nintendo Switch Nintendo Direct 3.8.2018
50:49 Splatoon 2 Ver. 4 Nintendo Switch
52:41 Splatoon 2 Octoling 3Pack New amiibo
53:10 Splatoon 2 Final Splatfest Announcement Nintendo Switch
54:23 Splatoon 2 Final Splatfest 'Thank You' Trailer Nintendo Switch
58:30 Splatoon 3 Announcement Trailer Nintendo Switch
1:01:34 Splatoon 3 – “Return of the Mammalians” – Nintendo Switch
1:03:41 Splatoon 3 Salmon Run Next Wave Trailer Nintendo Switch
1:06:14 Splatoon 3 – Release Date Revealed Nintendo Switch
1:10:05 Nintendo Switch – OLED Model Splatoon 3 Edition
1:10:50 Deep Cut: Anarchy Rainbow Splatoon 3 Nintendo Switch
1:12:42 Splatoon 3 Launch Trailer Nintendo Switch
1:13:11 Splatoon 3 Splatfest Announcement – Nintendo Switch
1:14:18 Splatoon 3 amiibo Release Date
1:15:36 What's New in Splatoon 3 Nintendo Switch
1:17:03 Deep Cut Concert 2022 Preview
1:17:28 Splatoon 3 Splatoon x Pokémon Splatfest Nintendo Switch
1:17:58 Splatoon 3 – Chill Season 2022 Announcement – Nintendo Switch
1:20:20 Splatoon 3: Expansion Pass Announcement Trailer Nintendo Direct 2.8.23
1:23:45 Splatoon 3 Squid Sisters City of Color (2023) Nintendo Switch
1:25:10 Splatoon 3 Squid Sisters Tomorrow's Nostalgia Today Nintendo Switch
1:27:19 Splatoon 3 – Liquid Sunshine Nintendo Switch
1:28:51 Splatoon 3 – Sizzle Season 2023 Announcement – Nintendo Switch