Do you mean the enemy Greedent are stealing farm from your team's jungle? That's an actual strategy some of the top players are implementing and it's actually kind-of funky! Greedent has quite a bit of survivability and mobility at the cost of little damage and being more of an annoyance than an actual threat, so early on in the game Skwovet can Tackle its way into the enemy jungle and start taking some experience. It means the jungler ends up under-levelled and puts Greedent's team ahead for potential team fights, such as the 8:50 Combee/Vespiquen spawns or the first objective. It's an interesting way to play, I wouldn't call it harassment personally. Annoying to face especially in un-coordinated battles like solo queue tends to be, but it's a different way to play. Give it a go sometime!
If you meant your team's Greedent was rushing to the enemy jungle and being killed on repeat then yeah that's a bad player, but the concept remains the same. We've all had teammates like that, all you can do is report them and then move on.
Nice to see Slow Smoke being used more often as an item - seems the buff it received did it some good! Honestly all the battle items seem reasonably balanced now - Potion and X Speed could maybe see some buffs but there's a clear use for every other option now even if it's a bit niche (like Fluffy Tail / Goal Getter). I'd like to see them tackle the held items soon because there isn't a ton of variety out there I don't think? Buddy Barrier, Focus Band, Score Shield and Muscle Band could use a nerf for sure - they're the quintessential held items for all Pokemon except pure Special Attackers, and even then sometimes they don't run Wise Glasses since Muscle Band offers more damage. Rocky Helmet, Leftovers, Assault Vest, Float Stone, Aeos Cookie and Shell Bell see either zero or very limited play and need a buff, and I'd maybe buff Wise Glasses too a little bit? The rest are okay, a bit niche perhaps but usable - Energy Amplifier, Exp. Share and Weakness Policy could maybe use smaller buffs but nothing major.
Also there's been a small update on the whole "log in after being gone for 15+ days and get a free Unite License" thing... there's a new in-game event going on! The Chinese New Year event is offering players log-in bonuses for 1, 3, 5 and 7 days I think - limited time holowear / Unite Licenses and a new ribbon currency. You get 10 ribbons a week - 1 on day 1 log-in, 2 on day 3 log-in, 3 on day 5 log-in and 4 on day 7 log-in - for up to 40 ribbons after the event ends (since it's a 4 week long event). Why is this relevant? You spend the ribbons on either holowear/costumes, or Unite Licenses - 10 ribbons nabs you a holowear/costume, and 14 ribbons gets you a Pokemon of your choice or their Aeos Coin equivalent. This means you can skip a week and still log in every day for 3 weeks straight to get 2 free Pokemon or 3 costumes! Or a combination of the two. I'm not sure if the Pokemon options are limited like the returning player bonuses, because the costumes/holowear are limited from what I've seen online so maybe the Pokemon are too?
Either way for me this means I'm not logging in until February 1st - that completes my 15 day absence so I get a returning player mission which gives me 4000 Aeos Coins and a free Pokemon (or a free 10,000 Aeos Coins). Then I log in every day for the next 3 weeks and can then pick two Unite Licenses for free, or their Aeos Coin equivalent - only Pokemon I'd like to own at the moment are Charizard, Mr. Mime, Wigglytuff, Trevenant, Aegislash and Cramorant, so with a potential 34,000 Aeos Coins on top of the 6000 I already have... I can buy a lot of these characters and round out my roster! Then I might actually have incentive to play...